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

src/ol/interaction/Pointer.js

@@ -41,6 +41,9 @@ import {getValues} from '../obj.js';
  * started. During a drag sequence the `handleDragEvent` user function is
  * called on `move` events. The drag sequence ends when the `handleUpEvent`
  * user function is called and returns `false`.
+ *
+ * @template {string} EventTypes
+ * @extends Interaction<EventTypes>
  * @api
  */
 class PointerInteraction extends Interaction {