Is there any DiT block defined in the huggingface/diffusers OR huggingface/transformers project?

**Is your feature request related to a problem? Please describe.**
I want to make some experiments about DiT based flow-matching model, I need an implementation of the common DiT block, but did not found it in both huggingface/diffusers and huggingface/transformers. Is there any implementation about it with just some other file names?

**Describe the solution you'd like.**
A clear DiT implementation

**Describe alternatives you've considered.**

**Additional context.**