feat(evil): vim completion keybinds on C-x

Vim has a set of completion commands bound to the C-x prefix. We had
this for company, but with this commit, we now have them for the corfu
module.

modules/completion/corfu/autoload.el

@@ -37,3 +37,13 @@
          (save-excursion (backward-char 1)
                          (insert-char ?\\)))
         (t (call-interactively #'corfu-insert-separator))))
+
+;;;###autoload
+(defun +corfu/dabbrev-this-buffer ()
+  "Like `cape-dabbrev', but only scans current buffer."
+  (interactive)
+  (require 'cape)
+  (let ((cape-dabbrev-check-other-buffers nil))
+    (cape-dabbrev t)))
+
+;;; end of autoload.el