Add Stable Diffusion RePaint to community pipelines (huggingface#3320)

* Add Stable Diffsuion RePaint to community pipelines

- Adds Stable Diffsuion RePaint to community pipelines
- Add Readme enty for pipeline

* Fix: Remove wrong import

- Remove wrong import
- Minor change in comments

* Fix: Code formatting of stable_diffusion_repaint

* Fix: ruff errors in stable_diffusion_repaint

Author: Markus-Pobitzer