Adding support for ETCD encryption with KMS

[Gordonby]

PR Summary

Closes #303

TODO

• [x] Get working for public kv scenario
• [ ] Add UI for KMS
• [ ] Complete work for supporting privatelink KV
• [ ] Remove debug outputs from bicep
• [ ] Delete KVPolicybased.bicep
• [ ] Create KMS Sample document that explains the bicep, that we can reference from the Azure Docs

PR Checklist

• [x] PR has a meaningful title
• [ ] Summarized changes
• [ ] This PR is ready to merge and is not Work in Progress
• [x] Link to a filed issue
• [ ] Screenshot of UI changes (if PR includes UI changes)