Feature/meta syntax sugar

[litedatum]

1. Create shared/utils/type_parser.py with reusable parsing logic
2. Modify cli/commands/schema.py to use new parser for existing type definitions
3. Enhance core/executors/schema_executor.py:
   • Add native_type, canonical_type, native_metadata to field_results
   • Ensure type information is returned even for TYPE_MISMATCH cases
4. Update related test files and documentation
5. Verify no regression in existing functionality

Resolved #37