Add Ruby SDK for gopher mcp with C binding

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Gopher MCP SDK – Ruby C Binding Extension

Overview

We need to extend the Gopher MCP SDK by adding C binding support in Ruby.
This will allow developers to interact with the native C library directly from the Ruby SDK, enabling seamless integration between low-level bindings and high-level MCP abstractions.

Requirements

• Implement a C binding layer in the Ruby SDK (using ffi, fiddle, or a suitable approach).
• Expose a clean, idiomatic Ruby API for interacting with the C functions.
• Ensure proper error handling, memory safety, and thread compatibility.
• Provide unit and integration tests for the binding layer.
• Add documentation and usage examples.

Deliverables

• Updated Ruby SDK with C binding.
• Example Ruby code demonstrating initialization and function calls.
• Documentation for setup and usage.

PR

#111