[refactor] Fix force decoding API response, Separate API response model and Model for View

[ChoiysApple]

1. Force decoding

Need to fix forced unwrapping when decoding API response:

// func requestData(contentId: Int)
let response = try! JSONDecoder().decode(MovieDetail.self, from: data)

There's too many try! code in project. Need to fix

2. Model seperation

This project is now using API response model for view.
Need to use different model for view and separate dependency between View <-> API