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User가 방에 들어올 때 마다
{roomId}-add-user에 대해 socket id와 uid를 emit한다.
새로 접속하는 user는 {roomId}-update-user-list로 현재 이 방에 접속해
있는 사람들에 대한 정보(socketId와 uid)를 받게된다.