updatePolylines method
Updates polyline configuration.
Change listeners are notified once the update has been made on the platform side.
The returned Future completes after listeners have been notified.
Implementation
@override
Future<void> updatePolylines(
  PolylineUpdates polylineUpdates, {
  required int mapId,
}) {
  return channel(
    mapId,
  ).invokeMethod<void>('polylines#update', polylineUpdates.toJson());
}