[Kolors] Add PAG (#8934)
* txt2img pag added
* autopipe added, fixed case
* style
* apply suggestions
* added fast tests, added todo tests
* revert dummy objects for kolors
* fix pag dummies
* fix test imports
* update pag tests
* add kolor pag to docs
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Co-authored-by: Sayak Paul <spsayakpaul@gmail.com>
