implementation of One-step Diffusion with Distribution Matching Distillation

### Model/Pipeline/Scheduler description

https://github.com/Zeqiang-Lai/OpenDMD

### 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

_No response_

Start by reviewing the OpenDMD implementation linked in the issue and compare its One-step Diffusion with Distribution Matching Distillation model, pipeline, and scheduler components with the diffusers project. Define the integration scope and completion criteria before implementing and validating the model weights and behavior.

索引モデルが issue の本文から書いたものです。