api/firebase_api library

1. ns_firebase_utils package
2. documentation
3. api/firebase_api.dart

ns_firebase_utils package

1. Libraries
2. analytics/analytics_service
3. reactive_widget/base_reactive_widget
4. utils/const_keys
5. constants
6. utils/custom_exception
7. api/firebase_api
8. api/firebase_group_api
9. storage/firebase_storage_service
10. extensions/map
11. src
12. ui/firestore/query_builder