[vcluster]: Add audit feature to apiserver

[adberger]

What this PR does:

Adds the ability to opt-in for audit logging of the apiServer.

Checklist:

• [x] Pull Request title in format [chart]: Changed Something
• [x] Updated documentation in the README.md.gotmpl file and executed helm-docs
• [x] Chart Version bumped
• [x] All commits are signed-off