[Feature] support `rednote-hilab/dots.ocr` DotsOCRForCausalLM

### Checklist

- [x] 1. If the issue you raised is not a feature but a question, please raise a discussion at https://github.com/sgl-project/sglang/discussions/new/choose Otherwise, it will be closed.
- [x] 2. Please use English, otherwise it will be closed.

### Motivation

https://huggingface.co/rednote-hilab/dots.ocr/blob/main/config.json

like MinerU

### Related resources

_No response_