Implements SOCKS5 and SOCKS5h proxy support as requested in issue #16812.
This adds native SOCKS proxy functionality to Bun's HTTP client:
- Support for socks5:// and socks5h:// protocols
- Environment variable support (http_proxy, https_proxy)
- Direct proxy option support in fetch()
- Full SOCKS5 handshake implementation
- Integration with existing HTTP proxy infrastructure
Key changes:
- Add SOCKSProxy.zig implementing SOCKS5 protocol
- Update HTTPThread.zig to recognize SOCKS protocols
- Modify HTTP client to handle SOCKS proxy tunneling
- Add URL helpers for SOCKS protocol detection
- Include comprehensive test coverage
Resolves issue #16812🤖 Generated with [Claude Code](https://claude.ai/code)
Co-Authored-By: Claude <noreply@anthropic.com>
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