[megatron] Support deepseek-v4 megatron#9386

Jintao-Huang wants to merge 3 commits into

modelscope:mainmodelscope/ms-swift:mainfrom

Jintao-Huang:support_deepseek_v4_megatronJintao-Huang/llmscope:support_deepseek_v4_megatronCopy head branch name to clipboard