Use auto_attribs/native type hints for attrs classes. (#11692)

changelog.d/11692.misc

synapse/api/room_versions.py

synapse/config/emailconfig.py

synapse/config/server.py

synapse/config/workers.py

synapse/crypto/keyring.py

synapse/events/snapshot.py

synapse/federation/sender/per_destination_queue.py

synapse/handlers/auth.py

synapse/handlers/e2e_keys.py

synapse/handlers/sso.py

synapse/http/connectproxyclient.py

synapse/http/matrixfederationclient.py

synapse/http/site.py

synapse/logging/_remote.py

synapse/logging/context.py

synapse/logging/opentracing.py

synapse/metrics/__init__.py

synapse/notifier.py

synapse/push/__init__.py