[Fix] #52 Cart, OrderDetail 네트워킹 의존성주입 #53
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1. 의존성주입을 위한 추상화
CartManager
3.해당 프토토콜을 따르는 객체를 외부에서 주입시켜줌(생성자를만들고 외부에서 주입)
OrderDetailManager
protocol에는 parameter의 기본값 설정이 안된다는사실을 알게됨