feat: api endpoints and xml sync for contingents data

src/BusProNet/XmlLoader/PickupLoader.php

@@ -16,6 +16,7 @@ class PickupLoader extends AbstractLoader
         try {
             return $this->cache->get('bpn_pickups', function (ItemInterface $item) use ($filename) {
                 $item->expiresAfter(3 * 60 * 60);
+                $item->tag(['xml-sync']);
 
                 $crawler = $this->loadXml($filename);
                 $pickupNodes = $crawler->filterXPath('//zustiege/zustieg');