Expose onDrag handler in AnnotationManager.

[fmatuszewski]

Can we expose onDrag handler in AnnotationManager the same way onTap is exposed

/// Called if a annotation is tapped
  final void Function(T)? onTap;
## The CHANGE
  final void Function(T)? onDrag;

    if (onTap != null) {
      controller.onFeatureTapped.add(_onFeatureTapped);
    }
    controller.onFeatureDrag.add(_onDrag);

  _onFeatureTapped(dynamic id, Point<double> point, LatLng coordinates) {
    final annotation = _idToAnnotation[id];
    if (annotation != null) {
      onTap!(annotation);
    }
  }

  _onDrag(dynamic id,
      {required Point<double> point,
      required LatLng origin,
      required LatLng current,
      required LatLng delta,
      required DragEventType eventType}) {
    final annotation = byId(id);
    if (annotation != null) {
      annotation.translate(delta);
      set(annotation);
## The CHANGE
      onDrag!(annotation);
## The CHANGE
    }
  }

[felix-ht]

yeah no reason why not - feel free to create a pull request

note that it should be

  `if (onDrag != null) onDrag!(annotation);`

[stale[bot]]

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