editor/format: general fix & refactor

+ Fixes function/command formatters (like #'gofmt)
+ Fixes formatting by region
+ Adds default keybindings:
  + gQ evil operator
  + SPC c f (normal mode) to format buffer
  + SPC c f (visual mode) to format selection

modules/editor/format/autoload/evil.el

@@ -0,0 +1,8 @@
+;;; editor/format/autoload/evil.el -*- lexical-binding: t; -*-
+;;;###if (featurep! :feature evil)
+
+;;;###autoload (autoload '+format:region "editor/format/autoload/evil" nil t)
+(evil-define-operator +format:region (beg end type)
+  "Evil ex interface to `+format-region'."
+  (interactive "<R>")
+  (+format-region beg end))