[New Pipeline]: SmoothCache: A Universal Inference Acceleration Technique for Diffusion Transformers

### Model/Pipeline/Scheduler description

Repo: https://github.com/Roblox/SmoothCache
Paper: https://huggingface.co/papers/2411.10510

This is a training-free acceleration technique for DiT pipelines, that controls caching behavior of individual components and works across different pipelines and modalities.

There is a non-intrusive helper class implemented for plug-and-play integration with Diffusers DiT Pipeline. No changes inside Diffusers needed for this to work.

We're happy to add SmoothCache in the form of a doc-only PR to benefit a broader user-base.

### Open source status

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

### Provide useful links for the implementation

_No response_