* [chore] add has_been_rescheduled flag for requests * [refactor] rename reschedule to preempted for accuracy and fix cache hit metrics * [chore] add ttft_s
* add trace logger and trace print * trigger ci * fix unittest * translate notes and add copyright --------- Co-authored-by: Jiang-Jia-Jun <163579578+Jiang-Jia-Jun@users.noreply.github.com> Co-authored-by: YuBaoku <49938469+EmmonsCurse@users.noreply.github.com>