Add support for focus mode triggers

[zenangst]

It would be interesting if workflows could launch based on the current focus mode. It might be something that we should consider investigating.

[zenangst]

I guess this is a good place to start - https://developer.apple.com/documentation/sirikit/infocusstatuscenter

That would at least give us the current focus mode. However, I'm unsure if we can get a list of the available focus modes that the user has setup.