Add support for az functionapp auth

[dariagrigoriu]

This would be similar to az webapp auth to support discoverability and configuration for the Authentication and Authorization experience.

Thanks for the feedback! We are routing this to the appropriate team for follow-up. cc @ahmedelnably, @fabiocav

[microsoft-github-policy-service]

Thanks for the feedback! We are routing this to the appropriate team for follow-up. cc @AnatoliB, @Francisco-Gamino, @shreyabatra4.