Enable drag and drag events on a fill layer

[rmmlopes]

Hi,

So either I've missed something incredibly simple or its not possible. I am creating a geojson source with a couple of polygon features, then creating a FillLayer with that source

`
await mapController!
.addSource("polygons", GeojsonSourceProperties(data: polyFeatures));

await mapController!.addFillLayer(
  "polygons",
  "polygons",
  const FillLayerProperties(
    fillColor: "#00DD00",
    fillOpacity: 0.3,
  ),
  enableInteraction: true,
);

`

This is in the onStyleLoadedCallback function. This works fine in that I see the polygons on the map, but am not able to drag them. If I add a polygon using the addFill function of the controller I am able to drag it. I do see tap events from the polygons in the onFeatureTapped handler that I add to the controller, but can't figure out how to get drag events. Not that that matters since I can't even drag the polygons in that layer.

Any help would be greatly appreciated!