[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/Test/Tests/Extensions/String+ConstantsTests.swift

@@ -6,7 +6,7 @@
 //  Copyright © 2024 Röck+Cöde VoF. All rights reserved.
 //
 
-import ReviewsFoundation
+import ReviewsFoundationKit
 import XCTest
 
 final class String_ConstantsTests: XCTestCase {
@@ -15,7 +15,7 @@ final class String_ConstantsTests: XCTestCase {
     private var sut: String!
     
     // MARK: Constants tests
-    func testEmpty() throws {
+    func testEmpty() {
         // GIVEN
         sut = .empty