vlinsert: improve opentelemetry decode perfomance

[vadimalekseev]

Describe Your Changes

TODO:

• Properly encode nested arrays
• Tests

                                                         │  /tmp/old.txt  │            /tmp/new.txt             │
                                                         │     sec/op     │   sec/op     vs base                │
ParseProtobufRequest/scopes_1/rows_100/attributes_5-14     19226.5n ±  3%   452.2n ± 3%  -97.65% (p=0.000 n=20)
ParseProtobufRequest/scopes_1/rows_100/attributes_10-14    19659.5n ±  3%   465.3n ± 1%  -97.63% (p=0.000 n=20)
ParseProtobufRequest/scopes_1/rows_1000/attributes_5-14     91.089µ ±  0%   4.434µ ± 5%  -95.13% (p=0.000 n=20)
ParseProtobufRequest/scopes_1/rows_1000/attributes_10-14    91.544µ ±  0%   4.317µ ± 5%  -95.28% (p=0.000 n=20)
ParseProtobufRequest/scopes_2/rows_100/attributes_5-14     35431.0n ± 13%   903.7n ± 3%  -97.45% (p=0.000 n=20)
ParseProtobufRequest/scopes_2/rows_100/attributes_10-14    36162.5n ±  1%   916.2n ± 3%  -97.47% (p=0.000 n=20)
ParseProtobufRequest/scopes_2/rows_1000/attributes_5-14    162.815µ ±  0%   8.472µ ± 6%  -94.80% (p=0.000 n=20)
ParseProtobufRequest/scopes_2/rows_1000/attributes_10-14   163.221µ ±  0%   8.194µ ± 5%  -94.98% (p=0.000 n=20)
geomean                                                      56.73µ         1.975µ       -96.52%

                                                         │ /tmp/old.txt  │               /tmp/new.txt               │
                                                         │      B/s      │      B/s        vs base                  │
ParseProtobufRequest/scopes_1/rows_100/attributes_5-14     4.959Mi ±  3%   210.896Mi ± 3%  +4152.69% (p=0.000 n=20)
ParseProtobufRequest/scopes_1/rows_100/attributes_10-14    4.854Mi ±  3%   204.959Mi ± 1%  +4122.30% (p=0.000 n=20)
ParseProtobufRequest/scopes_1/rows_1000/attributes_5-14    10.47Mi ±  0%    215.11Mi ± 5%  +1954.23% (p=0.000 n=20)
ParseProtobufRequest/scopes_1/rows_1000/attributes_10-14   10.41Mi ±  0%    220.95Mi ± 5%  +2021.61% (p=0.000 n=20)
ParseProtobufRequest/scopes_2/rows_100/attributes_5-14     5.383Mi ± 11%   211.067Mi ± 4%  +3820.64% (p=0.000 n=20)
ParseProtobufRequest/scopes_2/rows_100/attributes_10-14    5.274Mi ±  1%   208.192Mi ± 3%  +3847.65% (p=0.000 n=20)
ParseProtobufRequest/scopes_2/rows_1000/attributes_5-14    11.72Mi ±  0%    225.15Mi ± 7%  +1821.77% (p=0.000 n=20)
ParseProtobufRequest/scopes_2/rows_1000/attributes_10-14   11.68Mi ±  0%    232.76Mi ± 5%  +1892.41% (p=0.000 n=20)
geomean                                                    7.518Mi           216.0Mi       +2772.69%

Checklist

The following checks are mandatory:

• My change adheres to VictoriaMetrics contributing guidelines.
• My change adheres to VictoriaMetrics development goals.