Support SNI authentication with async CertificateCredential

[chlowell]

The Azure SDK relies on MSAL for SNI support, and MSAL Python doesn't have an async API (tracked here). In the meantime you can use the sync credential. Your token requests would then be blocking but those are infrequent, so the perf impact isn't bad.

[Moustafa-Moustafa]

Is there any update on the progress/status of this issue?

[github-actions]

Hi @chlowell, we deeply appreciate your input into this project. Regrettably, this issue has remained inactive for over 2 years, leading us to the decision to close it. We've implemented this policy to maintain the relevance of our issue queue and facilitate easier navigation for new contributors. If you still believe this topic requires attention, please feel free to create a new issue, referencing this one. Thank you for your understanding and ongoing support.