Invalidate the camera position when gesture finishes

[LukasPaczos]

Users have reported an issue, where fetching current camera position from
OnCameraIdleListener#onCameraIdle after gesture execution would not be up to date. For example, below calls to map.getCameraPosition().zoom might've resulted in slightly different values after zooming in/out.

map.addOnCameraIdleListener(() -> {
  new Handler().postDelayed(() -> Log.i("Test", "Delay at " +  map.getCameraPosition().zoom), 32);
  Log.i("Test", "Idled at " +  map.getCameraPosition().zoom);
});

During any gesture execution, we were invalidating the camera position only when the frame has been rendered, which is not guaranteed to happen before #onCameraIdle is delivered. We should invalidate before delivering that event to ensure consistency.