SASL: add support for OAUTHBEARER mechanism

[stevevls]

Describe the solution you'd like
Once #223 is merged, we can add support for Oauth authentication.

Supporting documentation
https://cwiki.apache.org/confluence/pages/viewpage.action?pageId=75968876
https://docs.confluent.io/current/kafka/authentication_sasl/authentication_sasl_oauth.html

[p53]

when you plan to implement this?

[stevevls]

Hi @p53. We don't have immediate plans to implement this feature, but if we'll happily accept PRs if you have the time to work on it. 😄

[achille-roussel]

This work still needs to be done.

[whirlp00l]

Are there any active work on going here?

[twleescobar]

Hey I have a PR with an implementation of OAUTHBEARER mechanism