Add AsyncScalingEnabled property to App Service Plan object

[amberwang113]

ARM (Control Plane) API Specification Update Pull Request

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Generated ApiView

Language	Package Name	ApiView Link
Go	sdk/resourcemanager/appservice/armappservice	Create ApiView timeout. Package is too large and we cannot create ApiView for it.
JavaScript	@azure/arm-appservice	https://apiview.dev/Assemblies/Review/98dbdc8147d7472b9bdff567a8b291bc?revisionId=1b91e63cd75f4592be867b511e908acc

[jianingwang123]

/azp run

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Azure Pipelines successfully started running 3 pipeline(s).

[amberwang113]

Decided against enum for AsyncScalingEnabled as this is clearly a binary property. Other PRs that are going in with this change are using boolean types, so we'll maintain that standard