Components need a way of reporting the dimensions of their UI obscuring a map or scene view

[dfeinzimer]

Certain components such as search, the un trace tool, floor filter stay on screen for an extended period and can end up covering significant portions of the screen. We need to identify a common pattern for components to report the size of their UI so that the .contentInsets() modifier can be usefully applied to a map or scene view.

Original report in Swift 3931:

The geo code result is off center and tucked behind they search widget. Probably a keyboard offer thing?

Components that can benefit from this:

Component	Evaluation
Authenticator	Not persistently on screen
BasemapGallery	Not persistently on screen
Bookmarks	Not persistently on screen
Compass	Too small
FloatingPanel	?
FloorFilter	✅
OverviewMap	✅
Popup	?
Scalebar	Too small
Search	✅
UtilityNetworkTrace	✅

safeAreaInset(edge:alignment:spacing:content:) seems to Apple's native solution to this. A quick test with the floor filter component is promising but there're some issues with the attribution bar

[mhdostal]

Related: #7