Convert all namedtuples to attrs. (#11665)

changelog.d/11665.misc

synapse/api/filtering.py

synapse/config/repository.py

synapse/federation/federation_base.py

synapse/federation/send_queue.py

synapse/handlers/appservice.py

synapse/handlers/directory.py

synapse/handlers/room_list.py

synapse/handlers/typing.py

synapse/http/server.py

synapse/replication/tcp/streams/_base.py

synapse/replication/tcp/streams/federation.py

synapse/rest/media/v1/media_repository.py

synapse/state/__init__.py

synapse/storage/databases/main/directory.py

synapse/storage/databases/main/events.py

synapse/storage/databases/main/room.py

synapse/storage/databases/main/search.py

synapse/storage/databases/main/state.py

synapse/storage/databases/main/stream.py