Jorwoods/type hint permissions (#940)

* Type hint permissions

* Type hint default permissions

* Remove hints from enums

* Remove unused import

Co-authored-by: Jac <jacalata@users.noreply.github.com>

Author: jorwoods

tableauserverclient/server/request_factory.py

@@ -16,7 +16,7 @@
 from ..models import TaskItem, UserItem, GroupItem, PermissionsRule, FavoriteItem
 from ..models import WebhookItem
 
-from typing import Any, Dict, List, Optional, TYPE_CHECKING, Tuple
+from typing import Any, Dict, List, Optional, TYPE_CHECKING, Tuple, Iterable
 
 if TYPE_CHECKING:
     from ..models import DataAlertItem