Changes to Read Feedbacks

the detail/items response's property type changed from object to string for status 422

removed the required property detail/items/loc from the response with the 422 status

removed the required property detail/items/msg from the response with the 422 status

removed the required property detail/items/type from the response with the 422 status

added the new optional query request parameter feedback_thread_id

added the optional property items/is_root to the response with the 200 status