Add support to Meissonic

Meissonic is a non-autoregressive mask image modeling text-to-image synthesis model that can generate high-resolution images. It is designed to run on consumer graphics cards.

The model checkpoint can be found in https://huggingface.co/MeissonFlow/Meissonic
The inference code can be found in https://github.com/viiika/Meissonic
The paper can be found in https://arxiv.org/abs/2410.08261

Anyone interested in implementing this?