feat: add debug logging support for Rust backend

- Implement debug logging in RustConnection that matches Net::HTTP format
- Add log_request and log_response methods with detailed HTTP transaction logs
- Update Rust client to properly handle request headers
- Add comprehensive RDoc documentation for logging methods
- Ensure feature parity between Ruby and Rust backends for debugging

Debug output format matches Net::HTTP's set_debug_output:
-> "GET https://api.example.com/users HTTP/1.1"
-> "accept: application/json"
-> ""
<- "HTTP/1.1 200"
<- "content-type: application/json"
<- ""
<- "{\"users\":[...]}"

This maintains the same debugging experience users expect from
the Ruby backend while providing the performance benefits of Rust.

🤖 Generated with [Claude Code](https://claude.ai/code)

Co-Authored-By: Claude <noreply@anthropic.com>

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