[Library] iTunes library (#5)

This PR contains the work done to implement the `iTunesService` service that fetches the reviews from the **Apple App Store**.

Reviewed-on: rock-n-code/app-reviews#5
Co-authored-by: Javier Cicchelli <javier@rock-n-code.com>
Co-committed-by: Javier Cicchelli <javier@rock-n-code.com>

Libraries/Foundation/Kit/Sources/Classes/MockURLProtocol.swift

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+//
+//  MockURLProtocol.swift
+//  ReviewsFoundationKit
+//
+//  Created by Javier Cicchelli on 17/03/2024.
+//  Copyright © 2024 Röck+Cöde VoF. All rights reserved.
+//
+
+import Foundation
+
+public class MockURLProtocol: URLProtocol {
+    
+    // MARK: Properties
+    public static var response: Response?
+    
+    // MARK: Functions
+    public override class func canInit(with task: URLSessionTask) -> Bool {
+        true
+    }
+    
+    public override class func canInit(with request: URLRequest) -> Bool {
+        true
+    }
+    
+    public override class func canonicalRequest(for request: URLRequest) -> URLRequest {
+        request
+    }
+    
+    public override func startLoading() {
+        guard
+            let url = request.url,
+            let response = Self.response
+        else {
+            client?.urlProtocolDidFinishLoading(self)
+            return
+        }
+        
+        if let data = try? response.data {
+            client?.urlProtocol(self, didLoad: data)
+        }
+
+        if let httpResponse = HTTPURLResponse(
+            url: url,
+            statusCode: response.statusCode,
+            httpVersion: nil,
+            headerFields: nil
+        ) {
+            client?.urlProtocol(
+                self,
+                didReceive: httpResponse,
+                cacheStoragePolicy: .allowedInMemoryOnly
+            )
+        }
+        
+        client?.urlProtocolDidFinishLoading(self)
+    }
+    
+    public override func stopLoading() {}
+    
+}
+
+// MARK: - Structs
+
+extension MockURLProtocol {
+    public struct Response {
+        
+        // MARK: Constants
+        public let statusCode: Int
+        public let object: (any Encodable)?
+        
+        // MARK: Initialisers
+        public init(
+            statusCode: Int,
+            object: (any Codable)? = nil
+        ) {
+            self.statusCode = statusCode
+            self.object = object
+        }
+        
+        // MARK: Computed
+        var data: Data? {
+            get throws {
+                guard let object else { return nil }
+
+                return try JSONEncoder.default.encode(object)
+            }
+        }
+
+    }
+}

Libraries/Foundation/Kit/Sources/Extensions/JSONDecoder+Constants.swift

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+//
+//  JSONDecoder+Constants.swift
+//  ReviewsiTunesKit
+//
+//  Created by Javier Cicchelli on 17/03/2024.
+//  Copyright © 2024 Röck+Cöde VoF. All rights reserved.
+//
+
+import Foundation
+
+extension JSONDecoder {
+    
+    // MARK: Constants
+    public static let `default` = {
+        let decoder = JSONDecoder()
+        
+        decoder.dateDecodingStrategy = .iso8601
+        
+        return decoder
+    }()
+    
+}

Libraries/Foundation/Kit/Sources/Extensions/JSONEncoder+Constants.swift

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+//
+//  JSONEncoder+Constants.swift
+//  ReviewsiTunesKit
+//
+//  Created by Javier Cicchelli on 17/03/2024.
+//  Copyright © 2024 Röck+Cöde VoF. All rights reserved.
+//
+
+import Foundation
+
+extension JSONEncoder {
+    
+    // MARK: Constants
+    public static let `default` = {
+        let encoder = JSONEncoder()
+        
+        encoder.dateEncodingStrategy = .iso8601
+        
+        return encoder
+    }()
+    
+}

Libraries/Foundation/Kit/Sources/Extensions/URL+Constants.swift

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+//
+//  URL+Constants.swift
+//  ReviewsFoundationKit
+//
+//  Created by Javier Cicchelli on 17/03/2024.
+//  Copyright © 2024 Röck+Cöde VoF. All rights reserved.
+//
+
+import Foundation
+
+extension URL {
+    
+    // MARK: Constants
+    public static let bitBucket: URL = {
+        if #available(iOS 16.0, *) {
+            .init(filePath: .FilePath.bitBucket)
+        } else {
+            .init(fileURLWithPath: .FilePath.bitBucket)
+        }
+    }()
+    
+}
+
+// MARK: - String+Constants
+private extension String {
+    enum FilePath {
+        static let bitBucket = "/dev/null"
+    }
+}

Libraries/Foundation/Kit/Sources/Extensions/URLSessionConfiguration+Constants.swift

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+//
+//  URLSessionConfiguration+Constants.swift
+//  ReviewsFoundationKit
+//
+//  Created by Javier Cicchelli on 17/03/2024.
+//  Copyright © 2024 Röck+Cöde VoF. All rights reserved.
+//
+
+import Foundation
+
+extension URLSessionConfiguration {
+    
+    // MARK: Constants
+    public static let mock = {
+        let configuration: URLSessionConfiguration = .ephemeral
+        
+        configuration.protocolClasses = [MockURLProtocol.self]
+        
+        return configuration
+    }()
+    
+}