Manuel Brack

[Pipeline] Add LEDITS++ pipelines

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# What does this PR do? We add a set of pipelines implementing the [LEDITS++](https://leditsplusplus-project.static.hf.space/index.html) image editing method. We provide an implementation for [StableDiffusion](https://github.com/huggingface/diffusers/blob/main/src/diffusers/pipelines/stable_diffusion/pipeline_stable_diffusion.py), [SD-XL](https://github.com/huggingface/diffusers/blob/main/src/diffusers/pipelines/stable_diffusion/pipeline_stable_diffusion.py) and [DeepFloyd-IF](https://github.com/huggingface/diffusers/blob/main/src/diffusers/pipelines/deepfloyd_if/pipeline_if.py). Additionally, we made...

As discussed previously, I implemented [edit-friendly DDPM inversion](https://arxiv.org/abs/2304.06140) drastically reducing runtime for the inversion step. Additionally, the edit quality/robustness benefits from the inversion guarantees of DDPM, thus eliminating any inversion...

The current implementation of `perplexity.compute` does not allow to provide a specific coda device (e.g. `cuda:1` instead of just `cuda`. https://github.com/huggingface/evaluate/blob/8dfe05784099fb9af55b8e77793205a3b7c86465/metrics/perplexity/perplexity.py#L108 Should probably be changed to something along the lines...