feat: add support dns

[GrapeBaBa]

No description provided.

[gemini-code-assist]

Summary of Changes

Hello @GrapeBaBa, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces new functionality to handle DNS-based addresses within the multiaddr parsing system. This enhancement allows the application to correctly interpret and process multiaddresses that specify DNS hostnames, including those explicitly for IPv4 and IPv6 DNS records, thereby expanding the range of network addresses that can be represented and utilized.

Highlights

• New Multiaddr Protocols: Added support for /dns, /dns4, and /dns6 protocols within the Multiaddr parsing logic, allowing for the interpretation of DNS hostnames in multiaddresses.
• Test Coverage: Included new test cases to validate the correct parsing of the newly supported DNS multiaddr formats, ensuring their proper functionality.

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[gemini-code-assist]

Code Review

This pull request adds support for dns, dns4, and dns6 multiaddr protocols. The implementation correctly adds parsing logic for these new protocols and includes corresponding test cases to ensure correctness. My review identifies an opportunity to refactor duplicated code in the parsing logic for better maintainability. Overall, a good addition to the library.

[gemini-code-assist]

The parsing logic for dns, dns4, and dns6 protocols is duplicated. You can combine these cases to reduce code duplication and improve maintainability, similar to how tcp and udp are handled.

            .dns, .dns4, .dns6 => blk: {
                const host = parts.next() orelse return Error.InvalidProtocolString;
                break :blk if (proto_name.len == 3) // "dns"
                    Protocol{ .Dns = host }
                else if (proto_name[3] == '4') // "dns4"
                    Protocol{ .Dns4 = host }
                else // "dns6"
                    Protocol{ .Dns6 = host };
            },