feat: expose rememberComposeBitmapDescriptor as public experimental API (#867)

* feat: expose rememberComposeBitmapDescriptor as public experimental API

* fix: add explicit public visibility modifier for explicit API mode

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Co-authored-by: Dale Hawkins <107309+dkhawk@users.noreply.github.com>

Author: kikoso

maps-compose/src/main/java/com/google/maps/android/compose/RememberComposeBitmapDescriptor.kt

@@ -15,8 +15,9 @@ import com.google.android.gms.maps.model.BitmapDescriptor
 import com.google.android.gms.maps.model.BitmapDescriptorFactory
 import androidx.core.graphics.createBitmap
 
+@MapsComposeExperimentalApi
 @Composable
-internal fun rememberComposeBitmapDescriptor(
+public fun rememberComposeBitmapDescriptor(
     vararg keys: Any,
     content: @Composable () -> Unit,
 ): BitmapDescriptor {