Cleanup old objects and add serializer

src/Objects/ApiListTransformer.php

@@ -6,19 +6,6 @@ namespace Ardent\GrocyApi\Objects;
 
 class ApiListTransformer
 {
-    private static function list(string $type): ?string
-    {
-        return match ($type) {
-            Category::getType() => Category::class,
-            SingleArticle::getType() => SingleArticle::class,
-            SingleArticleDetails::getType() => SingleArticleDetails::class,
-            Order::getType() => Order::class,
-            OrderLine::getType() => OrderLine::class,
-            OrderArticle::getType() => OrderArticle::class,
-            Delivery::getType() => Delivery::class,
-            default => null,
-        };
-    }
 
     public static function getObjects(array $items): array
     {