retries for failed API requests

Currently, pydrive2 uses googleapiclient for all Drive API operations, but doesn't retry any failed requests. However, the Drive API [recommends retries with exponential backoff](https://developers.google.com/drive/api/v3/handle-errors) for many errors, and [googleapiclient supports retries](https://github.com/googleapis/google-api-python-client/blob/c482712935d1c1331e33bd7f9968bd3b2be223bb/googleapiclient/http.py#L846) for all requests.

Would it be possible to add retry behavior as per the Drive API recommendations?

(Additionally, it'd be great to add this for the [initial client creation](https://github.com/iterative/PyDrive2/blob/c739ba379e4c656da5e229a21c39a4d621ada09b/pydrive2/auth.py#L610-L612), as the discovery service can also throw 500s.)

Thanks!

Start with pydrive2/auth.py around the initial client creation referenced in the issue, then trace how googleapiclient is used for Drive operations. Compare the requested behavior with the linked Drive API and googleapiclient retry guidance; done means failed Drive requests and initial discovery creation retry according to those recommendations.

Rédigé par le modèle d'indexation à partir du texte de l'issue.