feat: Support reproducable deployments #299

Given an existing deployment in Kubernetes, it should be possible to reproduce that install on another Kubernetes cluster.

Ideas:

• Store the stacablectl commit hash in the binary
• Add labels to all deployed manifests with:
  • The commit hash of stackablectl to differentiate behaviours between versions.
  • Any CLI parameters that influence the content of the manifests.
• Optional: CR/ConfigMap to track this stuff in Kubernetes so we don't need to rely on so many labels, then one label can refer to that CR/ConfigMap.