[FEATURE REQUEST] Add support of exposing meta_server_grains for Azure VMs

[nicholasmhughes]

Is your feature request related to a problem? Please describe.
setting metadata_server_grains: True in minion conf was not exposing cloud meta data grains in case of Azure VM

Describe the solution you'd like
setting metadata_server_grains: True in minion conf should expose cloud meta data grains in case of Azure VM

Describe alternatives you've considered
N/A

Additional context
This functionality was merged into the 3006.x core, but wasn't backported to master. It should live here anyway.

[nicholasmhughes]

Hello @guvishal989 !

Would you be interested in porting your work from saltstack/salt#63606 over to this extension repository? I'd be happy to help if you have any questions on how to get started.