fixed error with init file

Author: beltr0n

sdk/communication/azure-communication-identity/azure/communication/identity/__init__ .py renamed to sdk/communication/azure-communication-identity/azure/communication/identity/__init__.py

@@ -11,10 +11,21 @@
     CommunicationIdentityToken
 )
 
+from ._shared.models import (
+    CommunicationUserIdentifier,
+    PhoneNumberIdentifier,
+    UnknownIdentifier
+)
+
 __all__ = [
     'CommunicationIdentityClient',
 
     # from _identity
     'CommunicationTokenRequest',
     'CommunicationIdentityToken',
+
+    # from _shared
+    'CommunicationUserIdentifier',
+    'PhoneNumberIdentifier',
+    'UnknownIdentifier'
 ]