Restore pointerMove in condition.js and example.

Wrongly removed on previous commit as pointed by @ahocevar.

src/ol/events/condition.js

@@ -110,6 +110,19 @@ export const mouseActionButton = function(mapBrowserEvent) {
 export const never = FALSE;
 
 
+/**
+ * Return `true` if the browser event is a `pointermove` event, `false`
+ * otherwise.
+ *
+ * @param {import("../MapBrowserEvent.js").default} mapBrowserEvent Map browser event.
+ * @return {boolean} True if the browser event is a `pointermove` event.
+ * @api
+ */
+export const pointerMove = function(mapBrowserEvent) {
+  return mapBrowserEvent.type == 'pointermove';
+};
+
+
 /**
  * Return `true` if the event is a map `singleclick` event, `false` otherwise.
  *