Jorwoods/type hint user (#944)

* Type hint Users

* Type hint UserRequest

* Remove type hints from Roles and Auth namespaces

* Update user_item.py

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

Author: jorwoods

tableauserverclient/models/user_item.py

@@ -1,3 +1,4 @@
+from datetime import datetime
 import xml.etree.ElementTree as ET
 from datetime import datetime
 from typing import Dict, List, Optional, TYPE_CHECKING
@@ -13,6 +14,11 @@
 from .reference_item import ResourceReference
 from ..datetime_helpers import parse_datetime
 
+if TYPE_CHECKING:
+    from ..server.pager import Pager
+
+from typing import Dict, List, Optional, TYPE_CHECKING
+
 if TYPE_CHECKING:
     from ..server.pager import Pager