feat: export SqlComponent class in public API

Add SqlComponent to the main package exports to make it available for public use.
- Enables external access to core SQL component functionality
- Maintains consistent API structure with other model classes
- Supports extensibility for custom SQL processing implementations

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

Co-Authored-By: Claude <[email protected]>

Author: 2 people

packages/core/src/index.ts

@@ -6,6 +6,7 @@ export * from './parsers/WithClauseParser';
 
 export * from './models/BinarySelectQuery';
 export * from './models/SelectQuery';
+export * from './models/SqlComponent';
 export * from './models/ValueComponent';
 export * from './models/ValuesQuery';
 export * from './models/CTEError';