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/test.el

@@ -32,7 +32,7 @@ Should be one of:
 ;;; Commands
 
 ;; FIXME Will be fixed in v3.1
-(defstub! test
+(defcli-stub! test
     ((backend ("--ert" "--buttercup"))
      (jobs    ("-j" "--jobs" int))
      &rest targets)