Hunyuan-DiT Support

### Model/Pipeline/Scheduler description https://tencent.github.io/HunyuanDiT/asset/Hunyuan_DiT_Tech_Report_05140553.pdf uses a modification on DiT - should be pretty easy to integrate given diffusers already has a version of DiT in pipelines ### 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 Code - https://github.com/Tencent/HunyuanDiT/ CKPT - Tencent-Hunyuan/HunyuanDiT *from guys at Tencent*