Revert "Remove slaved id tracker (#14376)" (#14463)

changelog.d/14376.misc

synapse/replication/slave/__init__.py

synapse/replication/slave/storage/__init__.py

synapse/replication/slave/storage/_slaved_id_tracker.py

synapse/storage/databases/main/account_data.py

synapse/storage/databases/main/devices.py

synapse/storage/databases/main/events_worker.py

synapse/storage/databases/main/push_rule.py

synapse/storage/databases/main/pusher.py

synapse/storage/databases/main/receipts.py

synapse/storage/util/id_generators.py