Improve type hints in storage classes. (#11652)

changelog.d/11652.misc

synapse/storage/databases/main/deviceinbox.py

synapse/storage/databases/main/event_federation.py

synapse/storage/databases/main/event_push_actions.py

synapse/storage/databases/main/filtering.py

synapse/storage/databases/main/media_repository.py

synapse/storage/databases/main/pusher.py

synapse/storage/databases/main/registration.py

synapse/storage/databases/main/relations.py

synapse/storage/databases/main/ui_auth.py