add Instant id sdxl image2image pipeline (huggingface#7507)

* initial commit - instantid img2img

* adapting to img2img

* change add_time_ids

* change add_time_ids

* WIP changes

* add strength to timesteps

* check insightface import

* style

* check insightface import changed to warning

* check insightface import changed to warning

* style

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Co-authored-by: apolinário <[email protected]>

Author: 2 people