dispose method
Implementation
@mustCallSuper
void dispose() {
// clear all callbacks to avoid cyclic refs
onInfoWindowTappedPlatform.clear();
onFeatureTappedPlatform.clear();
onFeatureDraggedPlatform.clear();
onCameraMoveStartedPlatform.clear();
onCameraMovePlatform.clear();
onAnnotationUpdate.clear();
onCameraIdlePlatform.clear();
onMapStyleLoadedPlatform.clear();
onMapRenderedPlatform.clear();
onDidFinishedRenderingFrame.clear();
onMapClickPlatform.clear();
onMapLongClickPlatform.clear();
onCameraTrackingChangedPlatform.clear();
onCameraTrackingDismissedPlatform.clear();
onMapIdlePlatform.clear();
onUserLocationUpdatedPlatform.clear();
}