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주요 변경 사항
그룹 관련 이벤트 및 이벤트 핸들러를 제거합니다.
또, 이에 의해 관련된 모든 클래스를 수정 및 리팩토링합니다.
변경 이유
이벤트 개념을 운영하기엔 아래 이유 때문에 운영 비용이 상승합니다. 이에, 이벤트 대신 각 커맨드 핸들러에서 처리하는 방향으로 수정됩니다.