failures/notification_failure library

1. exception_type package
2. documentation
3. failures/notification_failure.dart

exception_type package

1. Libraries
2. constants/auth_failure_messages
3. constants/db_failure_messages
4. constants/server_error_constants
5. error_msg/get_auth_error_msg
6. error_msg/get_location_error_msg
7. error_msg/get_server_error_msg
8. error_msg/map_db_failure_to_message
9. error_msg/map_failure_to_msg
10. exception_type
11. failures/api_failure
12. failures/auth_failure
13. failures/db_failure
14. failures/dynamic_link_failure
15. failures/failures
16. failures/fire_store_db_failure
17. failures/firestorage_failure
18. failures/input_failure
19. failures/location_error
20. failures/network_failure
21. failures/notification_failure
22. failures/widget_failure
23. i_errors/i_failure