[Refactor] 채팅 api 수정#72

BAEK0111 merged 15 commits intodevelopASSU-dev/ASSU_BE:developfrom

refactor/#38-chatting-change-securityutil-to-principaldetailsASSU-dev/ASSU_BE:refactor/#38-chatting-change-securityutil-to-principaldetailsCopy head branch name to clipboard