MTP training for multi-modal

[lucasjinreal]

Checklist / 检查清单

• I have searched existing issues, and this is a new feature request. / 我已经搜索过现有的 issues，确认这是一个新的 Feature Request。

Feature Request Description / Feature Request 描述

since MTP already supported, would further consider support multi-modal MTP training?

Pull Request / Pull Request 信息

No response