Small improvements to sai-cli tool

[kaatrasa]

or @Bercon

[kaatrasa]

Example:

[ImportError] No module named 'cv2'
Try installing with
    pip install spectacularAI[full]

Traceback (most recent call last):
  File "python/run_sai_cli.py", line 4, in <module>
    main()
  File "/home/kaatr/git/sdk/python/cli/sai_cli.py", line 24, in main
    args.func(args)
  File "/home/kaatr/git/sdk/python/cli/process/process.py", line 379, in process
    import cv2
ModuleNotFoundError: No module named 'cv2'