nix: Add support for xcodes on Darwin systems

[kp-thomas-yau]

Enable xcodes as a development dependency and configure xcodes selection in the shell for macOS builds.

Description

Motivation and Context

How Has This Been Tested?

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• The correct base branch is being used, if not main

[github-actions]

Code coverage summary for 245bb7c:

Filename                                                     Regions    Missed Regions     Cover   Functions  Missed Functions  Executed       Lines      Missed Lines     Cover    Branches   Missed Branches     Cover
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
lightway-app-utils/src/args/cipher.rs                              5                 5     0.00%           1                 1     0.00%           5                 5     0.00%           0                 0         -
lightway-app-utils/src/args/connection_type.rs                     5                 5     0.00%           1                 1     0.00%           5                 5     0.00%           0                 0         -
lightway-app-utils/src/args/duration.rs                           19                15    21.05%           4                 3    25.00%          12                 9    25.00%           0                 0         -
lightway-app-utils/src/args/ip_map.rs                             19                19     0.00%           3                 3     0.00%          13                13     0.00%           0                 0         -
lightway-app-utils/src/args/logging.rs                            37                37     0.00%           3                 3     0.00%          31                31     0.00%           0                 0         -
lightway-app-utils/src/codec_ticker.rs                           140                17    87.86%          17                 4    76.47%          88                11    87.50%           0                 0         -
lightway-app-utils/src/connection_ticker.rs                      228                24    89.47%          28                 4    85.71%         125                15    88.00%           0                 0         -
lightway-app-utils/src/dplpmtud_timer.rs                         212                16    92.45%          22                 4    81.82%         117                11    90.60%           0                 0         -
lightway-app-utils/src/event_stream.rs                            19                 0   100.00%           3                 0   100.00%          11                 0   100.00%           0                 0         -
lightway-app-utils/src/sockopt/ip_mtu_discover.rs                 78                78     0.00%           6                 6     0.00%          68                68     0.00%           0                 0         -
lightway-app-utils/src/sockopt/ip_pktinfo.rs                      14                14     0.00%           1                 1     0.00%          16                16     0.00%           0                 0         -
lightway-app-utils/src/tun.rs                                    281               281     0.00%          31                31     0.00%         175               175     0.00%           0                 0         -
lightway-app-utils/src/utils.rs                                   21                21     0.00%           1                 1     0.00%          11                11     0.00%           0                 0         -
lightway-client/src/args.rs                                       35                14    60.00%           2                 1    50.00%          17                 8    52.94%           0                 0         -
lightway-client/src/dns_manager.rs                                16                16     0.00%           3                 3     0.00%          11                11     0.00%           0                 0         -
lightway-client/src/io/inside/tun.rs                              78                78     0.00%          11                11     0.00%          57                57     0.00%           0                 0         -
lightway-client/src/io/outside/tcp.rs                             80                80     0.00%          11                11     0.00%          48                48     0.00%           0                 0         -
lightway-client/src/io/outside/udp.rs                            123               123     0.00%          13                13     0.00%          74                74     0.00%           0                 0         -
lightway-client/src/keepalive.rs                                 808                64    92.08%          67                 8    88.06%         435                32    92.64%           0                 0         -
lightway-client/src/lib.rs                                       774               638    17.57%          56                45    19.64%         535               445    16.82%           0                 0         -
lightway-client/src/main.rs                                      187               187     0.00%          12                12     0.00%         146               146     0.00%           0                 0         -
lightway-client/src/platform/linux/dns_manager.rs                144                64    55.56%          16                 6    62.50%          94                40    57.45%           0                 0         -
lightway-client/src/route_manager.rs                            1008               213    78.87%          63                 7    88.89%         550               115    79.09%           0                 0         -
lightway-core/src/borrowed_bytesmut.rs                           378                 1    99.74%          24                 0   100.00%         189                 1    99.47%           0                 0         -
lightway-core/src/builder_predicates.rs                           24                12    50.00%           4                 2    50.00%          24                12    50.00%           0                 0         -
lightway-core/src/cipher.rs                                       13                 0   100.00%           2                 0   100.00%          10                 0   100.00%           0                 0         -
lightway-core/src/connection.rs                                 1276               646    49.37%          59                24    59.32%         885               423    52.20%           0                 0         -
lightway-core/src/connection/builders.rs                         230                47    79.57%          21                 8    61.90%         241                53    78.01%           0                 0         -
lightway-core/src/connection/dplpmtud.rs                        1738                95    94.53%          63                 0   100.00%         811                 9    98.89%           0                 0         -
lightway-core/src/connection/fragment_map.rs                     380                15    96.05%          25                 0   100.00%         258                 7    97.29%           0                 0         -
lightway-core/src/connection/io_adapter.rs                       528                26    95.08%          34                 5    85.29%         275                21    92.36%           0                 0         -
lightway-core/src/connection/key_update.rs                        34                13    61.76%           5                 0   100.00%          38                19    50.00%           0                 0         -
lightway-core/src/context.rs                                     193                39    79.79%          25                 7    72.00%         201                40    80.10%           0                 0         -
lightway-core/src/context/ip_pool.rs                               8                 3    62.50%           1                 0   100.00%           5                 0   100.00%           0                 0         -
lightway-core/src/context/server_auth.rs                          35                27    22.86%           4                 3    25.00%          24                20    16.67%           0                 0         -
lightway-core/src/encoding_request_states.rs                       3                 0   100.00%           1                 0   100.00%           3                 0   100.00%           0                 0         -
lightway-core/src/io.rs                                           10                10     0.00%           3                 3     0.00%           9                 9     0.00%           0                 0         -
lightway-core/src/lib.rs                                          20                11    45.00%           4                 1    75.00%          18                 9    50.00%           0                 0         -
lightway-core/src/metrics.rs                                      37                37     0.00%          15                15     0.00%          33                33     0.00%           0                 0         -
lightway-core/src/packet.rs                                       38                10    73.68%           4                 1    75.00%          30                 6    80.00%           0                 0         -
lightway-core/src/plugin.rs                                      304                13    95.72%          21                 3    85.71%         145                 7    95.17%           0                 0         -
lightway-core/src/utils.rs                                       339                31    90.86%          22                 2    90.91%         165                17    89.70%           0                 0         -
lightway-core/src/version.rs                                      94                 0   100.00%          17                 0   100.00%          82                 0   100.00%           0                 0         -
lightway-core/src/wire.rs                                        426                35    91.78%          28                 0   100.00%         225                 7    96.89%           0                 0         -
lightway-core/src/wire/auth_failure.rs                            27                 1    96.30%           3                 0   100.00%          17                 0   100.00%           0                 0         -
lightway-core/src/wire/auth_request.rs                           472                12    97.46%          26                 0   100.00%         241                 0   100.00%           0                 0         -
lightway-core/src/wire/auth_success_with_config_ipv4.rs          223                 4    98.21%          11                 0   100.00%         124                 0   100.00%           0                 0         -
lightway-core/src/wire/data.rs                                    52                 1    98.08%           5                 0   100.00%          34                 0   100.00%           0                 0         -
lightway-core/src/wire/data_frag.rs                              131                 1    99.24%          14                 0   100.00%          82                 0   100.00%           0                 0         -
lightway-core/src/wire/encoding_request.rs                        82                 2    97.56%           6                 0   100.00%          42                 1    97.62%           0                 0         -
lightway-core/src/wire/encoding_response.rs                       82                 2    97.56%           6                 0   100.00%          42                 1    97.62%           0                 0         -
lightway-core/src/wire/ping.rs                                    96                 3    96.88%           7                 0   100.00%          59                 0   100.00%           0                 0         -
lightway-core/src/wire/pong.rs                                    58                 2    96.55%           5                 0   100.00%          31                 0   100.00%           0                 0         -
lightway-core/src/wire/server_config.rs                           69                 2    97.10%           4                 0   100.00%          37                 0   100.00%           0                 0         -
lightway-server/src/auth.rs                                      282                55    80.50%          22                 6    72.73%         171                28    83.63%           0                 0         -
lightway-server/src/connection.rs                                140               140     0.00%          11                11     0.00%         110               110     0.00%           0                 0         -
lightway-server/src/connection_manager.rs                        339               339     0.00%          39                39     0.00%         275               275     0.00%           0                 0         -
lightway-server/src/connection_manager/connection_map.rs         409                22    94.62%          21                 1    95.24%         228                 8    96.49%           0                 0         -
lightway-server/src/io/inside/tun.rs                              44                44     0.00%           9                 9     0.00%          30                30     0.00%           0                 0         -
lightway-server/src/io/outside/tcp.rs                             90                90     0.00%           9                 9     0.00%          65                65     0.00%           0                 0         -
lightway-server/src/io/outside/udp.rs                            320               320     0.00%          16                16     0.00%         204               204     0.00%           0                 0         -
lightway-server/src/io/outside/udp/cmsg.rs                       182                47    74.18%          14                 5    64.29%         160                44    72.50%           0                 0         -
lightway-server/src/ip_manager.rs                                550                58    89.45%          22                 4    81.82%         247                28    88.66%           0                 0         -
lightway-server/src/ip_manager/ip_pool.rs                        542                 1    99.82%          27                 0   100.00%         252                 0   100.00%           0                 0         -
lightway-server/src/lib.rs                                       257               257     0.00%          13                13     0.00%         167               167     0.00%           0                 0         -
lightway-server/src/main.rs                                      232               232     0.00%          11                11     0.00%         122               122     0.00%           0                 0         -
lightway-server/src/metrics.rs                                   257               253     1.56%          85                83     2.35%         215               211     1.86%           0                 0         -
lightway-server/src/statistics.rs                                138                62    55.07%           8                 4    50.00%          89                37    58.43%           0                 0         -
------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
TOTAL                                                          15513              5030    67.58%        1151               464    59.69%        9359              3370    63.99%           0                 0         -

✅ Region coverage 67% passes
✅ Line coverage 63% passes