feat: enhanced serialization & type conversation process

[cofin]

1. Enhanced Serialization System (sqlspec/_serialization.py)

   • Protocol-based design with extensible serializer system
   • Byte-aware operations with msgspec → orjson → stdlib fallback
   • Overloaded functions for type-safe string/bytes output

2. Centralized Type Conversion (sqlspec/core/type_conversion.py)

   • Universal type detection with pre-compiled regex patterns
   • Performance optimized with quick pre-checks
   • Base classes for database-specific type handling

3. Database-Specific Enhancements

   • PostgreSQL: Cast-aware parameter preparation for JSON/JSONB
   • DuckDB: Native UUID support integration
   • BigQuery: Enhanced UUID support for standard and ADBC drivers
   • Oracle: Intelligent LOB parameter handling