feat: MailJet list handling with DOI, webhook receiver and API endpoint

addresses #869cut134

src/Exception/NewsletterListNotAllowedException.php

@@ -0,0 +1,35 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Exception;
+
+class NewsletterListNotAllowedException extends \InvalidArgumentException
+{
+    /**
+     * @param list<int> $listIds
+     * @param list<int> $unknownListIds
+     */
+    public function __construct(
+        private readonly array $listIds,
+        private readonly array $unknownListIds,
+    ) {
+        parent::__construct('One or more Mailjet list IDs are not allowed.');
+    }
+
+    /**
+     * @return list<int>
+     */
+    public function getListIds(): array
+    {
+        return $this->listIds;
+    }
+
+    /**
+     * @return list<int>
+     */
+    public function getUnknownListIds(): array
+    {
+        return $this->unknownListIds;
+    }
+}