[ActivityStreamsTwo] Introduce a structure for data representation in ActivityStreams 2.0

Type factory borrowed from landrok/activitypub

plugins/ActivityStreamsTwo/Util/Model/AS2ToEntity/AS2ToEntity.php

@@ -0,0 +1,21 @@
+<?php
+
+namespace Plugin\ActivityStreamsTwo\Util\Model\AS2ToEntity;
+
+use App\Core\Entity;
+
+abstract class AS2ToEntity
+{
+    /**
+     * @param array $activity
+     *
+     * @return Entity
+     */
+    public static function translate(array $activity): Entity
+    {
+        return match ($activity['type']) {
+            'Note'  => AS2ToNote::translate($activity),
+            default => Entity::create($activity),
+        };
+    }
+}