Add gesture recognizer in example

Author: stuartmorgan-g

packages/google_maps_flutter/google_maps_flutter_ios/example/lib/map_coordinates.dart

@@ -4,6 +4,8 @@
 
 // ignore_for_file: public_member_api_docs
 
+import 'package:flutter/foundation.dart';
+import 'package:flutter/gestures.dart';
 import 'package:flutter/material.dart';
 import 'package:google_maps_flutter_platform_interface/google_maps_flutter_platform_interface.dart';
 
@@ -46,6 +48,12 @@ class _MapCoordinatesBodyState extends State<_MapCoordinatesBody> {
       initialCameraPosition: _kInitialPosition,
       onCameraIdle:
           _updateVisibleRegion, // https://github.com/flutter/flutter/issues/54758
+      gestureRecognizers: //
+          <Factory<OneSequenceGestureRecognizer>>{
+        Factory<OneSequenceGestureRecognizer>(
+          () => EagerGestureRecognizer(),
+        ),
+      },
     );
 
     return NotificationListener<ScrollNotification>(