Feat(OSPC-163): Introduce vault

[cloudnull]

Uses kustomize to deploy vault helm chart.

• Prior installation:
  • It requires some storage available in the cluster. As user will install vault prior deploying CEPH, the cluster will not be having any storage configured. Hence, we need to consider local storage from the Kubernetes nodes. We can go with Rancher local path provisioner for the same[1].
  • It expects vault-tls-public Kubernetes secret containing FQDN ssl cert/key. We can encrypt "vault-tls-public" using sealed-secret and push to git to consume it using argocd.

[1]
https://github.com/rancher/local-path-provisioner