[Sana Sprint] add image-to-image pipeline (#11602)
* sana sprint img2img
* fix import
* fix name
* fix image encoding
* fix image encoding
* fix image encoding
* fix image encoding
* fix image encoding
* fix image encoding
* try w/o strength
* try scaling differently
* try with strength
* revert unnecessary changes to scheduler
* revert unnecessary changes to scheduler
* Apply style fixes
* remove comment
* add copy statements
* add copy statements
* add to doc
* add to doc
* add to doc
* add to doc
* Apply style fixes
* empty commit
* fix copies
* fix copies
* fix copies
* fix copies
* fix copies
* docs
* make fix-copies.
* fix doc building error.
* initial commit - add img2img test
* initial commit - add img2img test
* fix import
* fix imports
* Apply style fixes
* empty commit
* remove
* empty commit
* test vocab size
* fix
* fix prompt missing from last commits
* small changes
* fix image processing when input is tensor
* fix order
* Apply style fixes
* empty commit
* fix shape
* remove comment
* image processing
* remove comment
* skip vae tiling test for now
* Apply style fixes
* empty commit
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Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>
Co-authored-by: sayakpaul <spsayakpaul@gmail.com>
