Add type hints to tests/rest/client (#12108)

* Add type hints to `tests/rest/client`

* newsfile

* fix imports

* add `test_account.py`

* Remove one type hint in `test_report_event.py`

* change `on_create_room` to `async`

* update new functions in `test_third_party_rules.py`

* Add `test_filter.py`

* add `test_rooms.py`

* change to `assertEquals` to `assertEqual`

* lint

changelog.d/12108.misc

@@ -0,0 +1 @@
+Add type hints to `tests/rest/client`.

mypy.ini

@@ -78,13 +78,7 @@ exclude = (?x)
    |tests/push/test_http.py
    |tests/push/test_presentable_names.py
    |tests/push/test_push_rule_evaluator.py
-   |tests/rest/client/test_account.py
-   |tests/rest/client/test_filter.py
-   |tests/rest/client/test_report_event.py
-   |tests/rest/client/test_rooms.py
-   |tests/rest/client/test_third_party_rules.py
    |tests/rest/client/test_transactions.py
-   |tests/rest/client/test_typing.py
    |tests/rest/key/v2/test_remote_key_resource.py
    |tests/rest/media/v1/test_base.py
    |tests/rest/media/v1/test_media_storage.py