Add template metadata to deploy VM-Series in different availability zones

[divyabhushan]

Description

Add template to deploy VM-Series in different availability zones in Azure

Motivation and Context

• Moving this template from https://github.com/wwce/azure-arm/tree/master/Azure-Common-Deployments/v1/2fw_3nic_zone_intlb_extlb repo to official Azure repo.
• Submitted a doc change to call out for this template over here
• This new use case will be published right under Use the ARM Template to Deploy the VM-Series Firewall

How Has This Been Tested?

The template has been tested by Tech Alliance Architect (Palo Alto Networks) and QAs.

Screenshots (if appropriate)

Types of changes

• New use case to deploy VM-Series
• Doc changes

Checklist

• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes if appropriate.
• All new and existing tests passed.

[divyabhushan]

@djspears @jigarshah04 @jasonmeurer This PR is needed for a doc to be published in the Palo Alto TechDocs for VM-Series deployment. Could you please review and approve?
Cc: @chanduusc @btorresgil @rt696b75
Thanks

[divyabhushan]

@narayan-iyengar Could you please merge this PR already approved by Revant. Thank you