[Feature] will support qwen3.5-mtp training and qwen3.5-eagle3 training?

### Checklist - [ ] 1. If the issue you raised is not a feature but a question, please raise a discussion at https://github.com/sgl-project/SpecForge/discussions/new/choose Otherwise, it will be closed. - [ ] 2. Please use English, otherwise it will be closed. ### Motivation Frist of all, thanks for your work,it's really fantastic. And will you have a plan for supporting qwen3.5-mtp(actually eagle1) training and qwen3.5-eagle3? I have tested qwen3.5-mtp and it has a good performance, so I think maybe qwen3.5-eagle3 would be better. Sincerely waiting for your replay. ### Related resources _No response_