User/avinp/generate turn api

[apattath]

This PR updates the Azure.Communication.Identity library with an additional API GetTurnCredentials.
This endpoint in the service is gated behind an AFEC and enabled for a preview version.
This version of the SDK is intended to be generated only in private preview at this time and released through the dev feed (not the public nuget feed). Hence, the suggestion from Wes Haggard was to submit this to a feature branch and release SDK from the feature branch into the dev feed.

Link to PR with updated swagger: Azure/azure-rest-api-specs#12881

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• Please open PR in Draft mode if it is:
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Note: Only applies to Microsoft.Azure.Management.[RP] or Azure.ResourceManager.[RP]

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[jsquire]

I left a few thoughts; nothing that I'd consider blocking. As I don't have familiarity with the service, I'll defer to @RezaJooyandeh for final approval. I'm am happy to serve as the merge-button-preeser, if one is needed.

[RezaJooyandeh]

Ready to merge once you applied @jsquire 's comments.