Implement location status availability changes emmition after successful tracking start.

[qt-fulcrum]

Hi,
Users can turn off location services or deny location permission whenever Compass is used in the background. This leads to the absence of any location updates without any errors being emitted trackingStatus flow.
To handle such cases, LocationCallback.onLocationAvailability and CLLocationManagerDelegateProtocol.locationManagerDidChangeAuthorization (& maybe some others on iOS) have to be implemented, and status updates must be passed up to DefaultGeolocator.