Is your feature request related to a problem? Please describe.
Currently AdvancedMarker composable only supports iconView and pinConfig.
We'd like to be able to use AdvancedMarker with BitmapDescriptor icon.

As stated in the documentation using iconView can have performance impact:

Caution: Performance of a map view with iconView markers might not match the performance of bitmap or default markers.

Additionally we observed #414 when using AdvancedMarker with iconView.

Describe the solution you'd like
Add icon: BitmapDescriptor? = null parameter.
Proposed change: tgrenouille@4556a22.