Use generics to limit event types in on(), once() and un()

src/ol/control/Control.js

@@ -41,6 +41,8 @@ import {removeNode} from '../dom.js';
  * You can also extend this base for your own control class. See
  * examples/custom-controls for an example of how to do this.
  *
+ * @template {string} EventTypes
+ * @extends BaseObject<EventTypes>
  * @api
  */
 class Control extends BaseObject {