Is your feature request related to a problem? Please describe.
GroundOverlays always render below map content (specifically buildings that are enabled via isBuildingEnabled = true in MapProperties for instance) and there isn't any way to make GroundOverlays be rendered on top (i.e. their z index is always below everything else on the map).

Describe the solution you'd like
Add an API that offers the ability to for GroundOverlays to be rendered above other map content, and especially for buildings as that is needed for my team's use case where we want buildings to be drawn below our GroundOverlay image.

Describe alternatives you've considered
We tried working with the various shape APIs (Circle, Polygon, and Polyline) to see if any of those rendered above map content and found that none of those do either, though those also don't offer the same functionality we need which only GroundOverlay offers anyways.

Additional context
Below you can see examples of how buildings are always rendered on top of GroundOverlay, Circle, and Polygon:

GroundOverlay	Circle	Polygon