Create better Kubernetes liveness, readiness and startup Probes

[smoya]

Source: #71 (comment)

Probes should be based on the opened ports the app uses. That means, the application to be considered up, running and healthy should, at least:

• Respond to the configured HTTP port. This is a global health check that can also be used for telling K8s the app is not running properly (for example, if we catch some internal errors, etc and we need to stop the execution).
• Respond to the configured Websocket port.
• All Kafka opened ports should be able to respond to a Kafka Metadata Request. This can be made by using kcat or in the worst case, just a simple nc connection test.

[github-actions]

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