Add multi-language AST-pattern scanning support

- Introduced `patterns` module with language-specific vulnerability patterns.
- Added `query_cache` utility for caching compiled queries.
- Expanded `scan.rs` to support scanning multiple languages dynamically.
- Updated `Cargo.toml` with additional tree-sitter dependencies.
- Added severity filtering to `ScannerConfig` for better configuration.

src/utils/mod.rs

@@ -1,5 +1,6 @@
 pub mod project;
 pub mod config;
+pub(crate) mod query_cache;
 
 // Re-export commonly used functions for convenience
 pub use project::{get_project_info};