.load_ip_adapter in StableDiffusionXLAdapterPipeline (#6246)
* Added testing notebook and .load_ip_adapter to XLAdapterPipeline
* Added annotations
* deleted testing notebook
* Update src/diffusers/pipelines/t2i_adapter/pipeline_stable_diffusion_xl_adapter.py
Co-authored-by: YiYi Xu <yixu310@gmail.com>
* code clean up
* Add feature_extractor and image_encoder to components
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Co-authored-by: YiYi Xu <yixu310@gmail.com>
