[vllm] feat: add model saving func to dump vllm state_dict before and after update weights#5278

RobotGF wants to merge 2 commits intoverl-project:mainverl-project/verl:mainfrom

RobotGF:add_vllm_dump_utilsRobotGF/verl:add_vllm_dump_utilsCopy head branch name to clipboard