Add support for Azure VM (scaelsets) upstream type

[kevin-shelaga]

Gloo Edge Product

Enterprise

Gloo Edge Version

v1.16.x

Is your feature request related to a problem? Please describe.

Azure equivalent to https://docs.solo.io/gloo-edge/latest/guides/traffic_management/destination_types/ec2_upstream/

Describe the solution you'd like

Customer looking to have an Azure implementation which matches their AWS setup with VM discovery and balancing

Describe alternatives you've considered

No response

Additional Context

https://docs.solo.io/gloo-edge/latest/guides/traffic_management/destination_types/ec2_upstream/