Add Kafka health indicator

[behrangsa]

Implement a Kafka health indicator. Something similar to org.springframework.boot.actuate.amqp.RabbitHealthIndicator.

[snicoll]

Would you mind contributing a PR?

[Jcamilorada]

@snicoll I would like to give a try.

About help monitoring do you think we can use metric producer metrics or health scenario need to include produce and consume of health message?

[snicoll]

@Jcamilorada let's go with something basic first ("is Kafka up?"). We can refine later. Thanks!

[snicoll]

Closing in favour of PR #11515