feat: add WebAuthoringForFlows capability to Permission class (#1642)

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

Author: valsarajnivea

tableauserverclient/models/permissions_item.py

@@ -43,6 +43,7 @@ class Capability:
         CreateRefreshMetrics = "CreateRefreshMetrics"
         SaveAs = "SaveAs"
         PulseMetricDefine = "PulseMetricDefine"
+        WebAuthoringForFlows = "WebAuthoringForFlows"
 
         def __repr__(self):
             return "<Enum Capability: AddComment | ChangeHierarchy | ChangePermission ... (17 more) >"