[model, recipe, examples] feat: add Nemotron-3 Nano Omni support#3760

cuichenx wants to merge 4 commits into

mainNVIDIA-NeMo/Megatron-Bridge:mainfrom

chcui/nemotron_3_omni_prNVIDIA-NeMo/Megatron-Bridge:chcui/nemotron_3_omni_prCopy head branch name to clipboard