[Feature] Search by priority

[snewsome2]

Is your feature request related to a problem? Please describe. I'm putting priorities in, I can search using !1 but the flag ! negates labels etc. so it will return those as well.

Describe the solution you'd like Add a feature or function so you can search by priority, or have it so the priortiy key can be customised. Config option to set the identifier, then we can search using that and not break exisitng trello searches.

Describe alternatives you've considered Using trello search

Additional context None