refactor!(cli): rename cli definers for consistency

BREAKING CHANGE: If anyone is using Doom's CLI framework and are
defining their own CLIs with any of the following macros, they'll need
to be updated to their new names:

- defautoload! -> defcli-autoload!
- defgroup! -> defcli-group!
- defstub! -> defcli-stub!
- defalias! -> defcli-alias!
- defobsolete! -> defcli-obsolete!

These were renamed to make their relationship with CLIs more obvious;
they were too ambiguous otherwise.

lisp/cli/help.el

@@ -5,7 +5,7 @@
 ;; command is passed with -?, --help, or --version. They can also be aliased to
 ;; a sub-command to make more of its capabilities accessible to users, with:
 ;;
-;;    (defalias! (myscript (help h)) (:help))
+;;    (defcli-alias! (myscript (help h)) (:help))
 ;;
 ;; You can define your own command-specific help handlers, e.g.
 ;;