Changed VisitLocator signature so that it expects an object implementing an interface instead of two arbitrary callbacks

module/Core/src/Visit/VisitGeolocationHelperInterface.php

@@ -0,0 +1,20 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Shlinkio\Shlink\Core\Visit;
+
+use Shlinkio\Shlink\Core\Entity\Visit;
+use Shlinkio\Shlink\Core\Entity\VisitLocation;
+use Shlinkio\Shlink\Core\Exception\IpCannotBeLocatedException;
+use Shlinkio\Shlink\IpGeolocation\Model\Location;
+
+interface VisitGeolocationHelperInterface
+{
+    /**
+     * @throws IpCannotBeLocatedException
+     */
+    public function geolocateVisit(Visit $visit): Location;
+
+    public function onVisitLocated(VisitLocation $visitLocation, Visit $visit): void;
+}