Add Lumina-DiMOO as a pipeline

[qianyu-dlut]

Model/Pipeline/Scheduler description

Lumina-DiMOO is a unified multimodal model built on fully discrete diffusion. It supports a wide range of tasks, including text-to-image, image-to-image (editing, subject-driven generation, inpainting), and image understanding. It also outperforms existing open-source multimodal models with stronger results and much higher sampling efficiency. It would be great to have this model in diffusers.

Open source status

• The model implementation is available.
• The model weights are available (Only relevant if addition is not a scheduler).

Provide useful links for the implementation

project page: https://synbol.github.io/Lumina-DiMOO
code: https://github.com/Alpha-VLLM/Lumina-DiMOO
model weights: https://huggingface.co/Alpha-VLLM/Lumina-DiMOO

@synbol @ChinChyi