[AC-1923] Add endpoint to create client organization (#3977)

* Add new endpoint for creating client organizations in consolidated billing

* Create empty org and then assign seats for code re-use

* Fixes made from debugging client side

* few more small fixes

* Vincent's feedback

src/Core/AdminConsole/Enums/OrganizationStatusType.cs

@@ -3,5 +3,6 @@
 public enum OrganizationStatusType : byte
 {
     Pending = 0,
-    Created = 1
+    Created = 1,
+    Managed = 2,
 }