Move UFOGen Pipeline and Scheduler to Research Projects

[ParagEkbote]

Is your feature request related to a problem? Please describe.
After reviewing #6133 and a bit of searching has led me to the implementation of the UFOGen paper by the co-authors. By reading the repo ReadME and it seems there is no model checkpoints provided by the authors, only the training code. Does it make sense to move the pipeline to example/research projects?

Repo link: https://github.com/xuyanwu/SIDDMs-UFOGen

Please let me know.

cc: @yiyixuxu , @sayakpaul

[yiyixuxu]

sound good!

[github-actions]

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