[Framework] Feed list view in the Feed framework (#9)

This PR contains the work done to provide the existing `FeedViewController` view controller with real life data by integrating the `iTunesService` service into its view model. In addition, the list item cell has been design has been updated, and re-implemented using the `SwiftUI` framework.

Reviewed-on: rock-n-code/app-reviews#9
Co-authored-by: Javier Cicchelli <javier@rock-n-code.com>
Co-committed-by: Javier Cicchelli <javier@rock-n-code.com>

Libraries/UI/Kit/Sources/Components/HostingConfiguration.swift

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+//
+//  HostingConfiguration.swift
+//  ReviewsUIKit
+//
+//  Created by Javier Cicchelli on 18/03/2024.
+//  Copyright © 2024 Röck+Cöde. All rights reserved.
+//
+
+import SwiftUI
+
+public struct HostingConfiguration<Content: View>: UIContentConfiguration {
+    
+    // MARK: Type aliases
+    public typealias ContentClosure = () -> Content
+    
+    // MARK: Constants
+    fileprivate let hostingController: UIHostingController<Content>
+    
+    // MARK: Initialisers
+    public init(@ViewBuilder content: ContentClosure) {
+        hostingController = UIHostingController(rootView: content())
+    }
+    
+    // MARK: Functions
+    public func makeContentView() -> UIView & UIContentView {
+        ContentView<Content>(self)
+    }
+    
+    public func updated(
+        for state: UIConfigurationState
+    ) -> HostingConfiguration<Content> {
+        self
+    }
+    
+}
+
+// MARK: - Classes
+class ContentView<Content: View>: UIView, UIContentView {
+    
+    // MARK: Properties
+    var configuration: UIContentConfiguration {
+        didSet {
+            configure(configuration)
+        }
+    }
+    
+    // MARK: Initialisers
+    init(_ configuration: UIContentConfiguration) {
+        self.configuration = configuration
+        
+        super.init(frame: .zero)
+    }
+    
+    required init?(coder: NSCoder) {
+        // This view shouldn't be initialized this way so we crash
+        fatalError("init(coder:) has not been implemented")
+    }
+    
+}
+
+// MARK: - Helpers
+private extension ContentView {
+    
+    // MARK: Functions
+    func configure(_ configuration: UIContentConfiguration) {
+        guard
+            let configuration = configuration as? HostingConfiguration<Content>,
+            let parent = findNextViewController()
+        else {
+            return
+        }
+        
+        let hostingController = configuration.hostingController
+        
+        guard 
+            let swiftUICellView = hostingController.view,
+            subviews.isEmpty
+        else {
+            hostingController.view.invalidateIntrinsicContentSize()
+            return
+        }
+        
+        hostingController.view.backgroundColor = .clear
+        
+        parent.addChild(hostingController)
+        addSubview(hostingController.view)
+        
+        hostingController.view.translatesAutoresizingMaskIntoConstraints = false
+
+        NSLayoutConstraint.activate([
+            leadingAnchor.constraint(equalTo: swiftUICellView.leadingAnchor),
+            trailingAnchor.constraint(equalTo: swiftUICellView.trailingAnchor),
+            topAnchor.constraint(equalTo: swiftUICellView.topAnchor),
+            bottomAnchor.constraint(equalTo: swiftUICellView.bottomAnchor)
+        ])
+        
+        hostingController.didMove(toParent: parent)
+    }
+    
+}

Libraries/UI/Kit/Sources/Extensions/UIView+Functions.swift

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+//
+//  UIView+Functions.swift
+//  ReviewsUIKit
+//
+//  Created by Javier Cicchelli on 19/03/2024.
+//  Copyright © 2024 Röck+Cöde VoF. All rights reserved.
+//
+
+import UIKit
+
+extension UIView {
+    
+    // MARK: Functions
+    func findNextViewController() -> UIViewController? {
+        if let nextResponder = next as? UIViewController {
+            return nextResponder
+        } else if let nextResponder = next as? UIView {
+            return nextResponder.findNextViewController()
+        }
+        
+        return nil
+    }
+    
+}

Libraries/UI/Kit/Sources/Extensions/View+Modifiers.swift

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+//
+//  View+Modifiers.swift
+//  ReviewsUIKit
+//
+//  Created by Javier Cicchelli on 19/03/2024.
+//  Copyright © 2024 Röck+Cöde VoF. All rights reserved.
+//
+
+import SwiftUI
+
+extension View {
+    
+    // MARK: Functions
+    public func fullWidth(alignment: Alignment = .leading) -> some View {
+        modifier(FullWidthModifier(alignment: alignment))
+    }
+    
+}

Libraries/UI/Kit/Sources/Modifiers/FullWidthModifier.swift

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+//
+//  FullWidthModifier.swift
+//  ReviewsUIKit
+//
+//  Created by Javier Cicchelli on 19/03/2024.
+//  Copyright © 2024 Röck+Cöde VoF. All rights reserved.
+//
+
+import SwiftUI
+
+struct FullWidthModifier: ViewModifier {
+    
+    // MARK: Constants
+    private let alignment: Alignment
+    
+    // MARK: Initialisers
+    init(alignment: Alignment) {
+        self.alignment = alignment
+    }
+    
+    // MARK: Functions
+    func body(content: Content) -> some View {
+        content
+            .frame(
+                maxWidth: .infinity,
+                alignment: alignment
+            )
+    }
+    
+}
+
+// MARK: - Previews
+#Preview {
+    Group {
+        Text("Hello, world!")
+            .modifier(FullWidthModifier(alignment: .leading))
+        Text("Hello, world!")
+            .modifier(FullWidthModifier(alignment: .center))
+        Text("Hello, world!")
+            .modifier(FullWidthModifier(alignment: .trailing))
+    }
+    .padding(.horizontal)
+}