Update automatic retries and Implement Retryable interface for token endpoint requests

[TimurSadykov]

Currently, clients do not have a good way to distinguish retryable errors and implement custom retry strategies. Sometimes this causes infinite retries like here: googleads/google-ads-ruby#246
Please consider fixing with a priority since its affecting services like Ads.

In addition, the implementation of automatic retries requires some changes to follow Auth service guidelines.

More details in the doc: go/auth-correct-retry

[diegosaul402]

Any updates on this? I'm also facing this error.

[tmck-code]

Also seeing this error 🤚

[jheathco]

Infinite loop here as well

[simonknoll]

Also having the infinite loop issue googleads/google-ads-ruby#246

[zerobearing2]

Infinite loop here as well

[OliverGilan]

I am also seeing this error

[TimurSadykov]

@viacheslav-rostovtsev was this effectively fixed with googleads/google-ads-ruby#246 (comment)?