[App Services] Support DNL scopes during Site Creation

[nineela]

Related command

az webapp create --domain-name-scope SubscriptionReuse

Description
Add Deterministic Naming Support during App Service Creation. This changes the default hostname format to contain a deterministic hash along with a regionalized URL

Testing Guide
az webapp create --resource-group "cli-rg-test" --plan "cli-asp-test" --name "last-test-nineela101" --runtime "python|3.8" --domain-name-scope SubscriptionReuse

This would create web app with default hostname containing the DNL hash (16 chars) along with the region name.
Example : last-test-nineela101-dmatcmdfbsd4cwhf.eastus-01.azurewebsites.net

History Notes

[Component Name 1] BREAKING CHANGE: az command a: Make some customer-facing breaking change
[Component Name 2] az command b: Add some customer-facing feature

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