CLI: add a watch mode that automatically re-indexes local files when a change occurs

[Stevenic]

The command should be something like vectra watch <index> --keys <keys> --list <path list>. This should be done after #22 is finished.

[GaureeshAnvekar]

Does this have to be using a cron job, or before every query check if the index has to be updated and do it right before the query?

[Stevenic]

@GaureeshAnvekar it would use file system events to listen for folder changes