Generate new cmdlets for the first stable version of GA

[arpit-gagneja]

Description

We have checked in the first stable version (GA) for swagger (Azure/azure-rest-api-specs#19553).
Based on this swagger, we want to create new cmdlets and ship new module for GA to our customers.

Checklist

• I have read the Submitting Changes section of CONTRIBUTING.md
• The title of the PR is clear and informative
• The appropriate ChangeLog.md file(s) has been updated:
  • For any service, the ChangeLog.md file can be found at src/{{SERVICE}}/{{SERVICE}}/ChangeLog.md
  • A snippet outlining the change(s) made in the PR should be written under the ## Upcoming Release header -- no new version header should be added
• The PR does not introduce breaking changes
• If applicable, the changes made in the PR have proper test coverage
• For public API changes to cmdlets:
  • a cmdlet design review was approved for the changes in this repository (Microsoft internal only)
    • {Please put the link here}
  • the markdown help files have been regenerated using the commands listed here

[BethanyZhou]

The PR looks good to me. If you want to GA Az.DnsResolver, please follow the GA process: https://github.com/Azure/azure-powershell-pr/wiki/Process-of-GA-module