speed up cli commands and startup times

[lorenzejay]

Note

Convert package and CLI to lazy-load heavy modules, minimizing import overhead and speeding up command startup.

• Core (crewai/__init__.py):
  • Introduce lazy attribute access via __getattr__ to defer imports of Agent, Crew, Flow, LLM, etc.
  • Move Telemetry imports inside _track_install and _track_install_async to avoid eager import costs.
  • Keep public API via __all__ while reducing import-time work.
• CLI (crewai/cli/cli.py):
  • Replace top-level imports with on-demand imports inside command handlers (e.g., create, train, replay, deploy, tool, flow, triggers, org, enterprise, config).
  • Update uv wrapper to import utils lazily and construct env at runtime.

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