Add retry count to the response

[janssen-tiobe]

To get a visual on how many retries have been done before a fetch requests passes or fails it would be nice if something like that could be added to the response. This would enable users of the library to verify the amount of retries done and to show that in in applications potentially.

[dustinsmith1024]

This would be nice to add. I wouldn't mind a hook to just make my own function to run though. Then we could add logging, metics, etc on retries.