Changes to Get the Batch API's current limits

added the non-success response with the status 403

added the optional property error/allowed_models_hint to the response with the 401 status

added the optional property error/denied_by to the response with the 401 status

added the optional property error/model to the response with the 401 status

added the optional property error/param to the response with the 401 status

added the optional property error/permission to the response with the 401 status

endpoint added