카테고리 - 아이템 ManyToMany를 사용했다. 중간 테이블(CATEGORY_ITEM)에 컬럼을 추가할 수 없고, 세밀하게 쿼리를 실행하기 어렵기 떄문에 실무에서 사용하기에는 한계가 있다. 중간 엔티티(CategoryItem)을 만들고 @ManyToOne, @OneToMany로 풀어서 사용하는것이 바람직하다.
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