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55660cfb - Improve dynamic thresholding and extend to DDPM and DDIM Schedulers (#2528)

Improve dynamic thresholding and extend to DDPM and DDIM Schedulers (#2528) * Improve dynamic threshold * Update code * Add dynamic threshold to ddim and ddpm * Encapsulate and leverage code copy mechanism Update style * Clean up DDPM/DDIM constructor arguments * add test * also add to unipc --------- Co-authored-by: Peter Lin <peterlin9863@gmail.com> Co-authored-by: Patrick von Platen <patrick.v.platen@gmail.com>