Enhancement: add support to packaging and publishing helm chart

[yaakov-berkovitch]

Description

JKube doesn't support packaging and publishing charts. It may be very useful to include those functionalities and so to avoid using additional maven plugin for this.

Info

• If it's a feature request, what is your use case :
  Add support for packaging and publishing helm chart.

[dloiacono]

I can do that

[manusa]

As agreed in the sync meeting, it would be good to implement this in similar way as Helm Maven Plugin does it via REST API.

We would be looking to implement the core logic in this package|module: https://github.com/eclipse/jkube/tree/master/jkube-kit/resource/helm/src/main/java/org/eclipse/jkube/kit/resource/helm

The implemented service should be then consumed by the HelmMojo and the future Gradle plugins.