add winiotsvcs stable api

[bfjelds]

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[azuresdkci]

Can one of the admins verify this patch?

[bfjelds]

This was reviewed and approved in the PR branch: https://github.com/Azure/azure-rest-api-specs-pr/pull/789.

[AutorestCI]

Automation for azure-sdk-for-python

The initial PR has been merged into your service PR:
Azure/azure-sdk-for-python#6415

[AutorestCI]

Automation for azure-sdk-for-java

The initial PR has been merged into your service PR:
Azure/azure-sdk-for-java#4487

[AutorestCI]

Automation for azure-sdk-for-go

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Azure/azure-sdk-for-go#5308

[sarangan12]

This is the same as https://github.com/Azure/azure-rest-api-specs-pr/pull/789/files. Also this has ARM Approval. Approving and Merging this now....