New format workflow

[CubesterYT]

Add a new workflow that should format a PR when a message is "!format"

Further testing by others is needed.

[CST1229]

I still think this should be a workflow_dispatch workflow, and not a comment-based one.

[CubesterYT]

Are workflow_dispatchs accessible by normal people?

[GarboMuffin]

If they enable GitHub actions on their fork. Do they need to do that anyways for this to work?

[CubesterYT]

As it currently works, when the comment command is said, actions will auto format the PR, in theory. I haven't done extensive testing, so I'd like if others actually tried.

[CST1229]

As it currently works, when the comment command is said, actions will auto format the PR, in theory. I haven't done extensive testing, so I'd like if others actually tried.

i don't think actions would allow committing on a user's branch without them enabling actions (see also: sa's autoformat action which i'm pretty sure you do have to enable actions for)