map

MGLTilePyramidOfflineRegion should have a countOfTiles method that returns the number of tiles included in the tile pyramid. The implementation would rely on the mbgl::util::tileCount() function added in #9906.

This is the iOS/macOS equivalent to #11108 for Android. It would serve as a built-in alternative to mapbox/turf-swift#47 for applications already using the map SDK, including applica

maptalks's version and what browser you use?
v0.43.0, chrome

Issue description
Layers do not share WebGL context, which creates glitches when a map has more than one 3d layer. For example a buildings layer with a 3D line will not hide the line behind the buildings.
In particular, I am implementing a 3D terrain layer but this layer will not hide (behind mountains) any other 3d element

getVisibleBounds() method doen't work in map box v10

class ....{
.....
onRegionDidChange(){
          const  bounds = await this.mapBoxRef.current.getVisibleBounds();
.....}

render{    
return( <Mapbox.MapView
                ref={this.mapBoxRef}
          { flex: 1 }]}
                
                onRegionDidChange={e => {
                  this.mapUpdate(e);