Support a migration API
We need the ability to migrate conversations content to Microsoft Teams. Currently the API does not support:
1. Creating a conversation for a file.
2. Creating a discussion with a title/subject.
3. Creating comments/responses on a thread.
4. Attributing the actual author for a conversation (need app principal)
5. Specifying the timestamp of a thread and comment responses.
If the API supported all of the above we could migrate content to Microsoft Teams.