Changes to Create Conversation

added the optional property text_session_id to the response with the 201 status

added the optional property voice_call_id to the response with the 201 status

added the optional property action_item_id to the response with the 201 status

the response property user_id became optional for the status 201

response property user_id list-of-types was widened by adding types null to media type application/json of response 201

added the optional property channel to the response with the 201 status

added the optional property external_conversation_id to the response with the 201 status

added the optional property external_thread_key to the response with the 201 status

added the optional property integration_connection_id to the response with the 201 status

added the optional property detail/items/ctx to the response with the 422 status

added the optional property detail/items/input to the response with the 422 status