[`PEFT`] Adapt example scripts to use PEFT (#5388)
* adapt example scripts to use PEFT
* Update examples/text_to_image/train_text_to_image_lora.py
* fix
* add for SDXL
* oops
* make sure to install peft
* fix
* fix
* fix dreambooth and lora
* more fixes
* add peft to requirements.txt
* fix
* final fix
* add peft version in requirements
* remove comment
* change variable names
* add few lines in readme
* add to reqs
* style
* fix issues
* fix lora dreambooth xl tests
* init_lora_weights to gaussian and add out proj where missing
* ammend requirements.
* ammend requirements.txt
* add correct peft versions
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Co-authored-by: Sayak Paul <spsayakpaul@gmail.com>
