Allow moving account data and receipts streams off master (#9104)

changelog.d/9104.feature

synapse/app/generic_worker.py

synapse/config/workers.py

synapse/handlers/account_data.py

synapse/handlers/read_marker.py

synapse/handlers/receipts.py

synapse/handlers/room_member.py

synapse/replication/http/__init__.py

synapse/replication/http/account_data.py

synapse/replication/slave/storage/_base.py

synapse/replication/slave/storage/account_data.py

synapse/replication/slave/storage/receipts.py

synapse/replication/tcp/handler.py

synapse/rest/client/v2_alpha/account_data.py

synapse/rest/client/v2_alpha/tags.py

synapse/server.py

synapse/storage/databases/main/__init__.py

synapse/storage/databases/main/account_data.py

synapse/storage/databases/main/deviceinbox.py

synapse/storage/databases/main/event_push_actions.py