Wan 2.1 CineScale - up to 4K

### Model/Pipeline/Scheduler description

Wan 2.1 up to 4k
https://eyeline-labs.github.io/CineScale/

### 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

https://github.com/Eyeline-Labs/CineScale

Start by reviewing the CineScale project at https://github.com/Eyeline-Labs/CineScale and its model description at https://eyeline-labs.github.io/CineScale/, then compare the implementation with diffusers' existing Wan 2.1 integration conventions. Done means the model is integrated into diffusers with the expected usage and validation coverage established by the project.

Scritto dal modello di indicizzazione a partire dal testo della issue.