vim: Add repeat support for add_surround (#14746)

Fix: #14242

At present, we don't trigger the method `start_recording(cx)` to start
recording when typing add_surround, so it can't be repeated well, delete
and change actually don't increase, but when entering `d` and `c`, it
happens that these two operations are recorded, I think maybe we also
need to call `start_recording(cx)` when calling delete_surround and
change_surround, otherwise when the user modifies their shortcuts, these
two functions may not be supported by repeat

Release Notes:

- N/A