fix(DATAGO-125814): implement lazy imports to improve CLI startup performance

[cyrus2281]

What is the purpose of this change?

This change improves the CLI startup performance by implementing lazy imports, ensuring that heavy dependencies like Flask and SQLAlchemy are only loaded when actually needed rather than at startup time.

How was this change implemented?

• fix: implement lazy imports to improve CLI startup performance
  • Moved imports of Flask, SQLAlchemy, and other heavy dependencies inside the functions that use them
  • Implemented lazy imports in web configuration portal modules
  • Made imports in run, eval, and tools commands load only when the command is executed
  • Enhanced version display to show enterprise package version when installed

Key Design Decisions

Lazy importing was chosen as a lightweight solution to improve CLI responsiveness without restructuring the codebase. This approach provides immediate performance benefits while maintaining backward compatibility and requiring minimal code changes.

How was this change tested?

• Manual testing: CLI startup time before and after changes
• Unit tests: Updated version display tests to verify enterprise version detection
• Integration tests: N/A
• Known limitations: Could affect error reporting if imports fail at runtime instead of startup

Is there anything the reviewers should focus on/be aware of?

Reviewers should check that error handling is appropriate when imports fail at runtime rather than startup.

[RohanSreelesh]

LG