Added the layoutType property to the channel resource.

Why it matters: Upcoming change

Added the layoutType property to the channel resource. Added the channelLayoutType enumeration to the channel resource. The enumeration defines layout types for channels with values post (traditional post-reply), chat (chat-like threading), and unknownFutureValue . Updated the Create channel method to support the layoutType optional property in the request body. Users can now specify the channel layout type during creation. Updated the Update channel method to support updating the layoutType property. Users can switch between post and chat layouts at any time.

Affected: Microsoft Graph, Teamwork and communications

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