* feat(key_management_endpoints.py): adding support for rotating master key
* feat(key_management_endpoints.py): support decryption-re-encryption of models in db, when master key rotated
* fix(user_api_key_auth.py): raise valid token is None error earlier
enables easier debugging with api key hash in error message
* feat(key_management_endpoints.py): rotate any env vars
* fix(key_management_endpoints.py): uncomment check
* fix: fix linting error