Describe the bug
az keyvault set-policy needs an additional parameter to allow users to add an on-behalf-of access policy for user+application.

To Reproduce
No reproduction needed. It simply does not exist.

Expected behavior
Add "--applicationId" as a parameter which populates the "applicationId" property of an Azure Key Vault. This feature exists in the Azure Portal as well as Powershell and REST APIs.

Environment summary
All AFAIK.

Additional context
Documenation to -ApplicationId for Set-AzKeyVaultAccessPolicy