feat(vertico): add embark-collect-snapshot binding

The C-c C-s binding mirrors the export and writable export bindings.

embark-export is used for type specific exports (such as buffers to an
ibuffer buffer), not for verbatim exports. This is most noticeable if
you want to export a variable list, which gets you to an apropos buffer.
if you just want a list of things to keep around,
embark-collect-snapshot is the tool for the job, but having it be only
on C-; S makes it harder to reach and less visible. C-c C-s is a nice
visible thing to have around.

modules/completion/vertico/config.el

@@ -172,6 +172,7 @@ orderless."
         (:map minibuffer-local-map
          "C-;"               #'embark-act
          "C-c C-;"           #'embark-export
+         "C-c C-s"           #'embark-collect-snapshot
          :desc "Export to writable buffer" "C-c C-e" #'+vertico/embark-export-write)
         (:leader
          :desc "Actions" "a" #'embark-act)) ; to be moved to :config default if accepted