v1.4.0

• Add CockroachDB adapter for PostgreSQL compatibility
• Implement PostgreSQL enhanced parser with comprehensive features
• Create extensive examples directory with multiple use cases:
  • Database parsers configuration examples
  • CockroachDB adapter usage
  • ID generator implementations
  • Load balancing strategies
  • Monitoring and metrics
  • PostgreSQL enhanced parser demos
  • Read-write splitting examples
  • SQL optimizer demonstrations
• Update parser factory with enhanced PostgreSQL support
• Add comprehensive test suites for new parsers
• Update documentation and README files
• Fix go.mod dependencies and resolve linter issues