Changes to GET /private/get_order_state

the error response's property type changed from integer to object for status 400

removed the required property message from the response with the 400 status

added the optional property error/data to the response with the 400 status

added the required property error/code to the response with the 400 status

added the required property error/message to the response with the 400 status

added the optional property result/starbase_client_order_id to the response with the 200 status