[App Service] az webapp up: Add parameter --domain-name-scope to support specifying the scope of uniqueness for the default hostname during resource creation

[pranav-04]

Related command
az webapp up

Description
The change adds the support for --domain-name-scope parameter. The parameter helps customers to specify the domain name scope for the web app. For example, when creating the web app with --domain-name-scope SubscriptionReuse, it will create webapp with the domain of the format of [appname]-[unique-string].[region].azurewebsites.net instead of the default domain of [appnames].azurewebsites.net.

Testing Guide
az webapp up -g [resrouce-group] --subscription [azure-subscription] -p [appservice-plan] -n [webapp-name] --domain-name-scope TenantReuse

Detailed instructions on how to run az webapp up can be found here

History Notes

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Thank you for your contribution @pranav-04! We will review the pull request and get back to you soon.

[pvbchak]

LGTM

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