Improve editor UX

[nojaf]

Is your feature request related to a problem? Please describe.

Describe the solution you'd like

Right now the IDE only shows "Fix Issue" for a code action.
It would be nice if a better message could be passed into the fix.

Next, it would be great if a fix also can update other files (like the signature file).

Describe alternatives you've considered

For the message, maybe this can already somewhat be done on the FSAC side.

Additional context
Add any other context or screenshots about the feature request here.