Adopt signals in IndoorManager API (#7964)

- Use signals parameter instead of callback in IndoorManager, to allow
emitting to multiple subscribers
- Allow to use generateOnly with signals in bindgen
- Make lifecycle between map and indoor_manager safer, instead of raw
pointer indoor_manager stores map as std::weak_ptr
- mbgl::map now stores indoor_manager_impl as std::weak to propagate
events, implementation is shared while only strongly owned by it public
peer

cc @mapbox/gl-native
cc @mapbox/core-sdk
cc @mapbox/maps-android

GitOrigin-RevId: 75dcce5d1da0f28eac1a38eb60bf5929f0a46602

Author: aleksproger

app/src/main/java/com/mapbox/maps/testapp/examples/IndoorExampleActivity.kt

@@ -3,6 +3,8 @@ package com.mapbox.maps.testapp.examples
 import android.os.Bundle
 import androidx.appcompat.app.AppCompatActivity
 import com.mapbox.geojson.Point
+import com.mapbox.maps.IndoorManager
+import com.mapbox.maps.IndoorState
 import com.mapbox.maps.MapInitOptions
 import com.mapbox.maps.MapView
 import com.mapbox.maps.MapboxExperimental
@@ -41,11 +43,13 @@ class IndoorExampleActivity : AppCompatActivity() {
       mapboxMap.indoor.selectFloor(FLOOR_ID)
 
       // Listen to indoor state updates
-      mapboxMap.indoor.onIndoorUpdate { indoorState ->
-        logD(TAG, "Indoor state updated: $indoorState")
-        logD(TAG, "Available floors: ${indoorState.floors}")
-        logD(TAG, "Selected floor: ${indoorState.selectedFloorId}")
-      }
+      mapboxMap.indoor.setOnIndoorUpdatedCallback(object : IndoorManager.OnIndoorUpdatedCallback {
+        override fun onOnIndoorUpdated(onIndoorUpdated: IndoorState) {
+          logD(TAG, "Indoor state updated: $onIndoorUpdated")
+          logD(TAG, "Available floors: ${onIndoorUpdated.floors}")
+          logD(TAG, "Selected floor: ${onIndoorUpdated.selectedFloorId}")
+        }
+      })
     }
   }