Add provider to clusterctl

[Gerrit91]

Description

Here is link to how this can be done: https://cluster-api.sigs.k8s.io/developer/providers/contracts/clusterctl.html#adding-a-provider-to-clusterctl. Here is another example kubernetes-sigs/cluster-api#12357 for a PR not referenced in the book.

• Add --namespace flag to the reconcile controller
  • Add --namespace flag to watch only specific namespace if necessary. #114
• Add issue
• Raise PR
  • 🌱 CAPMS: Add metal-stack infrastructure provider kubernetes-sigs/cluster-api#12925