Request to implement FreeScale, a new diffusion scheduler

### Model/Pipeline/Scheduler description

FreeScale is a tuning-free method for higher-resolution visual generation, unlocking the 8k image generation for pre-trained SDXL! Compared to direct inference by SDXL, FreeScale brings negligible additional memory and time costs.



### Open source status

- [X] The model implementation is available.
- [X] The model weights are available (Only relevant if addition is not a scheduler).

### Provide useful links for the implementation

- Project: http://haonanqiu.com/projects/FreeScale.html
- Paper: https://arxiv.org/abs/2412.09626
- Code: https://github.com/ali-vilab/FreeScale
- Hugging Face Demo: https://huggingface.co/spaces/MoonQiu/FreeScale

The code changes of FreeScale are not complicated, but I do not know how to integrate them into diffusers smoothly. If you have questions about FreeScale, please ask me(@arthur-qiu).

Empieza leyendo el artículo de FreeScale y la implementación enlazada para entender los cambios del scheduler y cómo deberían integrarse en diffusers. Compara el comportamiento con la demo enlazada de Hugging Face; se considera terminado cuando FreeScale esté integrado correctamente en diffusers y su comportamiento de generación en alta resolución coincida con el método documentado.

Escrito por el modelo de indexación a partir del texto del issue.