Add "Fix all auto-fixable problems" quick fix option

Currently we only have quick fixes for a single problem at a time or for disabling a rule. We need an additional quick-fix option that applies all auto-fixable issues reported by AGLint in the current file.

We also need to introduce a command that can be triggered from the Command Palette (Cmd+Shift+P) to run AGLint’s auto-fix on the active file.

Finally, we should consider adding an extension setting to automatically apply AGLint fixes on file save.