feat: refactoring of xml parsers

tests/BusProNet/DataLoader/PickupDataLoaderTest.php

@@ -2,7 +2,7 @@
 
 namespace App\Tests\BusProNet\DataLoader;
 
-use App\BusProNet\XmlLoader\PickupXmlLoader;
+use App\BusProNet\XmlLoader\PickupLoader;
 use App\BusProNet\Model\Pickup;
 use PHPUnit\Framework\TestCase;
 
@@ -10,7 +10,7 @@ class PickupDataLoaderTest extends TestCase
 {
     public function testParse(): void
     {
-        $loader = new PickupXmlLoader();
+        $loader = new PickupLoader();
         $pickupId = 1;
 
         $xml = $loader->loadById($pickupId, 'pickups_data.xml');