Add 'delete-region' command

[VisenDev]

Delete region kills the selected region without copying it.

[summerice-1]

(define-command expand-region-delete () ()
  (if (region-p (current-point))
      (delete-between-points (current-point) (mark-point (cursor-mark (current-point))))
      (lem-paredit-mode:paredit-forward-delete  1)))

Do you need this command？
I made an expand-region system providing this feature ，however it not do well sometimes。
https://codeberg.org/summerice/lem-expand-region