Add availability zones information in the config file

[sebassem]

Overview/Summary

Add availability zones information in the config file. There will be another PR to the PowerShell module to leverage this information to default to zonal deployments in the networking modules.

This PR fixes/adds/changes/removes

fixes #735

Breaking Changes

N/A

Testing Evidence

This PR is just adding zones information in the config file

As part of this Pull Request I have

• Read the Contribution Guide and ensured this PR is compliant with the guide
• Ensured the resource API versions in .bicep file/s I am adding/editing are using the latest API version possible
• Checked for duplicate Pull Requests
• Associated it with relevant GitHub Issues
• (ALZ Bicep Core Team Only) Associated it with relevant ADO Items
• Ensured my code/branch is up-to-date with the latest changes in the main branch
• [] Performed testing and provided evidence.
• [] Updated one or more of the following tests (if required)
  • Unit
  • Linting
  • E2E (End-To-End)
  • ValidateAzCloud (Base validation in Azure Cloud)
  • ValidateMcCloud (Base validation in Azure China Cloud)
• Updated relevant and associated documentation (e.g. Contribution Guide, Module READMEs, Wiki Docs etc.)
• If relevant, created or updated Code Tours here