feat: Thumbnail 이미지 네트워크 요청 및 업데이트

didSelectRow 메소드에서 detail 정보를 받으면, 받은 thumbnail Image URL들을 가지고 네트워크 요청을 하여 요청을 받으면 각각 Thumbnail VC의 이미지를 업데이트

Issue: #38

ios/SideDishApp/SideDishApp/ViewControllers/DetailViewController.swift

@@ -58,6 +58,10 @@ class DetailViewController: UIViewController {
         deliveryInfoLabel.text = detail.deliveryInfo
     }
 
+    func updateThumbnailImage(at index: Int, image: UIImage?) {
+        thumbnailPageViewController.updateThumbnailImage(at: index, image: image)
+    }
+
     private func configureGradientBackgroundView() {
         let gradientLayer = CAGradientLayer()
         gradientLayerContainerView.backgroundColor = .clear

ios/SideDishApp/SideDishApp/ViewControllers/SideDishProductsViewController.swift

@@ -150,6 +150,20 @@ extension SideDishProductsViewController: UITableViewDelegate {
             DispatchQueue.main.async {
                 detailViewController.configureDetailViewController(title: product.title, with: detail)
             }
+
+            detail.thumbnailImageURLs.enumerated().forEach { (index, url) in
+                self.networkManager.fetchImage(from: url) { (result) in
+                    switch result {
+                    case .success(let data):
+                        let image = UIImage(data: data)
+                        DispatchQueue.main.async {
+                            detailViewController.updateThumbnailImage(at: index, image: image)
+                        }
+                    case .failure(_):
+                        break
+                    }
+                }
+            }
         }
         navigationController?.pushViewController(detailViewController, animated: true)
     }

ios/SideDishApp/SideDishApp/ViewControllers/ThumbnailViewController.swift

@@ -25,6 +25,10 @@ class ThumbnailViewController: UIViewController {
         configureImageView()
     }
 
+    func updateImage(_ image: UIImage?) {
+        self.imageView.image = image
+    }
+
     private func configureImageView() {
         view.addSubview(imageView)
         imageView.topAnchor.constraint(equalTo: view.topAnchor).isActive = true

ios/SideDishApp/SideDishApp/ViewControllers/ThumbnailsPageViewController.swift

@@ -37,6 +37,11 @@ class ThumbnailsPageViewController: UIPageViewController {
         configureUI()
     }
 
+    func updateThumbnailImage(at index: Int, image: UIImage?) {
+        let thumbnailViewController = thumbnailViewControllers[index]
+        thumbnailViewController.updateImage(image)
+    }
+
     private func configureUI() {
         view.backgroundColor = .clear
     }