[Core][KV Transfer] Support PD disagg + speculative decoding KV lifecycle#34926

ZhanqiuHu wants to merge 3 commits intovllm-project:mainvllm-project/vllm:mainfrom

ZhanqiuHu:pd-sd-delay-clearZhanqiuHu/vllm:pd-sd-delay-clearCopy head branch name to clipboard