feat(binding): add plugin registry for LSP method handlers

- Introduced PluginRegistry for dynamic method/action registration
- Refactored RequestTracker to support plugin-based processing
- Moved goto/hover logic to plugin actions for extensibility
- Updated check_for_methods to use plugin registry
- Improved rootUri/rootPath/workspaceFolders patching logic
- Updated proxy/io.rs to register plugins and pass to tracker

Author: richardhapb