[JPA] Entity가 Serializable를 구현하는 이유

https://www.inflearn.com/questions/16570/%EB%B2%84%EA%B7%B8-%EB%AC%B8%EC%9D%98%EB%93%9C%EB%A0%A4%EB%B4%85%EB%8B%88%EB%8B%A4