Support OAuth2 for Consuming and Producing messages to topics

[Nantero1]

As a security-aware developer,
I would like to get rid of API Keys and use the OAuth2 flow
to consume and produce messages from Confluent cloud.

This flow is already possible when using Confluent cloud and Java, see link above, bit not possible for SSO users when using the Confluent CLI. It would be a major security improvement.

This does not have to be a breaking change, it is just another possibility to authenticate.