[Feature] Support for Azure Virtual Network encryption for AKS

**Is your feature request related to a problem? Please describe.**
As a customer I need to ensure encryption between host of an AKS cluster.

**Describe the solution you'd like**
I would like to see support for AKS to use native azure vnet encryption as soon as that is available. The limitations seem great for most scenarios. https://learn.microsoft.com/en-us/azure/virtual-network/virtual-network-encryption-overview

**Describe alternatives you've considered**
Today we are using service mesh but that using istio/ linkerd just for encryption is a wast of computing power.