feat: enhance Rust tree-sitter parser with advanced language structures (#2335)

* test: add comprehensive Rust Tree-sitter tests

Add test suite for Rust language support in Tree-sitter:
- Verify parsing of struct definitions
- Verify parsing of method definitions within impl blocks
- Verify parsing of standalone function definitions
- Add tests for complex Rust structures
- Include skipped debug test for future diagnostics

These tests confirm the existing Rust support in Tree-sitter is working correctly and provide a foundation for future enhancements to the Rust parser.

Signed-off-by: Eric Wheeler <[email protected]>

* feat: enhance Rust tree-sitter parser with advanced language structures

- Add support for additional Rust language structures:
  - Enum definitions
  - Trait definitions
  - Impl trait for struct
  - Generic structs with lifetime parameters
  - Macro definitions
  - Module definitions
  - Union types
  - Closures
  - Match expressions
  - Where clauses
  - Async functions
  - Impl blocks with generic parameters
  - Complex trait bounds

- Update tests to verify capture of these structures
- Modify debug helper to use environment variables

Signed-off-by: Eric Wheeler <[email protected]>

---------

Signed-off-by: Eric Wheeler <[email protected]>
Co-authored-by: Eric Wheeler <[email protected]>

Author: KJ7LNW

src/services/tree-sitter/__tests__/helpers.ts

@@ -5,8 +5,8 @@ import * as path from "path"
 import Parser from "web-tree-sitter"
 import tsxQuery from "../queries/tsx"
 
-// Global debug flag - set to 0 to disable debug logging
-export const DEBUG = 0
+// Global debug flag - read from environment variable or default to 0
+export const DEBUG = process.env.DEBUG ? parseInt(process.env.DEBUG, 10) : 0
 
 // Debug function to conditionally log messages
 export const debugLog = (message: string, ...args: any[]) => {