RVRNEXT-24 add migration for slug for communities

database/migrations/data/20230507_0051_slug_for_communities.php

@@ -0,0 +1,12 @@
+<?php
+
+use RVR\PersistentData\Model\Community;
+use SokoWeb\Database\Query\Select;
+
+$select = new Select(Container::$dbConnection);
+$communities = Container::$persistentDataManager->selectMultipleFromDb($select, Community::class);
+
+foreach ($communities as $community) {
+    $community->generateSlug();
+    Container::$persistentDataManager->saveToDb($community);
+}