fix(mlkit): implement proper RNFaceDetectorModuleMLKit if FirebaseMLVision is una… (#2599)
fix(mlkit): implement proper RNFaceDetectorModuleMLKit if FirebaseMLVision is una… (#2599)

* implement proper RNFaceDetectorModuleMLKit if FirebaseMLVision is unavailable

* fix constants

lwansbrough/react-native-camera,lwansbrough/react-native-camera,lwansbrough/react-native-camera,lwansbrough/react-native-camera