Revert "refactor(ol-context-menu-control): make ol-contextmenu dependency optional"

This reverts commit 9994329.

Author: d-koppenhagen

docs/componentsguide/mapcontrols/contextmenu/index.md

@@ -4,12 +4,6 @@
 
 Right click on the map to open the contextmenu.
 
-This feature requires to additionally install the [`ol-contextmenu` package](https://www.npmjs.com/package/ol-contextmenu) as dependency:
-
-```bash
-npm i ol-contextmenu
-```
-
 <script setup>
 import ContextMenuDemo from "@demos/ContextMenuDemo.vue"
 </script>