Refactor instructpix2pix lora to support peft (#10205)
* make base code changes referred from train_instructpix2pix script in examples
* change code to use PEFT as discussed in issue 10062
* update README training command
* update README training command
* refactor variable name and freezing unet
* Update examples/research_projects/instructpix2pix_lora/train_instruct_pix2pix_lora.py
Co-authored-by: Sayak Paul <spsayakpaul@gmail.com>
* update README installation instructions.
* cleanup code using make style and quality
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Co-authored-by: Sayak Paul <spsayakpaul@gmail.com>
