[Feature Request]: Extend Azure NetApp Files module with CMK

[eriqua]

Description

Encryption is now supported by latest documented API version 2022-05-01
Add functionality consistently with other implementations (Ref to issue #2838)

[ahmadabdalla]

Enabling CMK for Net App is not GA yet and requires enabling a feature before it can be allowed:

https://learn.microsoft.com/en-us/azure/azure-netapp-files/configure-customer-managed-keys

Get-AzProviderFeature -ProviderNamespace Microsoft.NetApp -FeatureName ANFAzureKeyVaultEncryption                                                      

FeatureName                ProviderName     RegistrationState   
-----------                ------------     -----------------   
ANFAzureKeyVaultEncryption Microsoft.NetApp Registered

When attempting to enable it, we get 'Encryption with Azure Key Vault is not Allowed'

[eriqua]

Moved to blocked. Will revisit once the feature is GA.