Adds notification stats update into the callback process

- when a provider callback occurs and we update the status of the notification, also update the statistics table

Adds:
- Mapping object to the clients to handle mapping to various states from the response codes, this replaces the map.
- query lookup in the DAO to get the query based on response type / template type

Tests around rest class and dao to check correct updating of stats

Missing:
- multiple client callbacks will keep incrementing the counts of success/failure. This edge case needs to be handle in a future story.

tests/app/conftest.py

@@ -221,7 +221,6 @@ def sample_job(notify_db,
     }
     job = Job(**data)
     dao_create_job(job)
-    print(job.created_at)
     return job