Convert synapse.api to async/await (#8031)

changelog.d/8031.misc

synapse/api/auth.py

synapse/api/auth_blocking.py

synapse/api/filtering.py

synapse/events/builder.py

synapse/handlers/federation.py

synapse/handlers/message.py

synapse/module_api/__init__.py

synapse/push/bulk_push_rule_evaluator.py

synapse/replication/slave/storage/client_ips.py

synapse/rest/client/v1/directory.py

synapse/rest/client/v2_alpha/register.py

synapse/storage/databases/main/client_ips.py

tests/api/test_auth.py

tests/api/test_filtering.py

tests/handlers/test_typing.py

tests/rest/admin/test_user.py

tests/rest/client/v1/test_profile.py

tests/rest/client/v1/test_rooms.py

tests/rest/client/v1/test_typing.py