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* add paradigms parallel sampling pipeline

* linting

* ran make fix-copies

* add paradigms parallel sampling pipeline

* linting

* ran make fix-copies

* Apply suggestions from code review
Co-authored-by: Sayak Paul <spsayakpaul@gmail.com>

* changes based on review

* add docs for paradigms

* update docs with paradigms abstract

* improve documentation, and add tests for ddim/ddpm batch_step_no_noise

* fix docs and run make fix-copies

* minor changes to docs.

* Apply suggestions from code review
Co-authored-by: Patrick von Platen <patrick.v.platen@gmail.com>

* move parallel scheduler to new classes for DDPMParallelScheduler and DDIMParallelScheduler

* remove changes for scheduling_ddim, adjust licenses, credits, and commented code

* fix tensor type that is breaking tests

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Co-authored-by: Sayak Paul <spsayakpaul@gmail.com>
Co-authored-by: Patrick von Platen <patrick.v.platen@gmail.com>