Expose VCluster Status Fields as printer columns

[whiskeyjimbo]

This PR exposes the already set status values and adds some validation and documentation.

changes:

• Add kubebuilder validation for VCluster status fields
  • Default values for Ready and Initialized fields (false)
  • Enum validation for Phase field
• Add additional printer columns for better kubectl get vluster output:
  • Version
  • Ready
  • Phase
  • Message
  • Age

[johannesfrey]

Thx @whiskeyjimbo

There currently is a PR that allows the helm chart version to be empty, which will result in pulling the latest stable release. I guess looking at .spec.helmRelease.chart.version is good for now, though this would display an empty string when nothing is set by the user.

I guess I'll create a follow-up PR to retrieve the latest release tag and put that as a field under Status.