if the 'grep' argument is provided, the ui is called directly.
the api is not called with the ui as a callback (as would normally be
the case) because in this case the ui has to call the api on each input
change

run grep picker if 'grep' is given, otherwise run the other one

picker uses asynchronous calls to "zk list -m <search_term>" to live filter notes based on a search term
implemented based on Telescope's live_grep
does not include ability to jump to line since "zk list" does not give
this info

grep option insertion, instead of overwrite