Add missing type hints to synapse.replication. (#11938)

changelog.d/11938.misc

mypy.ini

synapse/replication/slave/storage/_slaved_id_tracker.py

synapse/replication/slave/storage/client_ips.py

synapse/replication/slave/storage/devices.py

synapse/replication/slave/storage/groups.py

synapse/replication/slave/storage/push_rule.py

synapse/replication/slave/storage/pushers.py

synapse/replication/tcp/client.py

synapse/replication/tcp/commands.py

synapse/replication/tcp/handler.py

synapse/replication/tcp/protocol.py

synapse/replication/tcp/redis.py

synapse/replication/tcp/resource.py

synapse/replication/tcp/streams/_base.py

synapse/replication/tcp/streams/events.py

synapse/util/stringutils.py

tests/replication/_base.py

tests/replication/tcp/test_remote_server_up.py