feat: Image saving for manga creation

tests/Domain/Manga/Adapter/InMemoryImageProcessor.php

@@ -0,0 +1,23 @@
+<?php
+
+namespace App\Tests\Domain\Manga\Adapter;
+
+use App\Domain\Manga\Domain\Contract\Service\ImageProcessorInterface;
+
+class InMemoryImageProcessor implements ImageProcessorInterface
+{
+    private const string FULL_IMAGE_PATH = '/images/full';
+    private const string THUMBNAIL_PATH = '/images/thumbnails';
+
+    public function downloadImage(string $imageUrl): string
+    {
+        $filename = sprintf('%s/%s.jpg', self::FULL_IMAGE_PATH, uniqid());
+        return $filename;
+    }
+
+    public function createThumbnail(string $originalImagePath): string
+    {
+        $filename = basename($originalImagePath);
+        return sprintf('%s/%s', self::THUMBNAIL_PATH, $filename);
+    }
+}