Add optional pulsar-heartbeat configuration to kaap-stack

[pgier]

There should be an option in kaap-stack to deploy pulsar-heartbeat configured to watch the deployed cluster.

[nicoloboschi]

The plan is to write the Pulsar Heartbeat chart and import it in KAAP stack, as we did for the admin console

[sumeet-zuora]

Do we have an update on when this would be rolled out