add ticket purchase page

Co-authored-by: Jan-Marlon Leibl <jleibl@proton.me>
Reviewed-on: http://git.simonis.lol/projects/abiball/pulls/13
Reviewed-by: jank1619 <jan@kjan.email>

src/DataObjects/TicketFormData.php

@@ -0,0 +1,20 @@
+<?php
+
+namespace App\DataObjects;
+
+use Symfony\Component\Serializer\Attribute\SerializedName;
+
+class TicketFormData
+{
+    /**
+     * @param PersonalData $personal
+     * @param TicketData[] $tickets
+     */
+    public function __construct(
+        #[SerializedName('personal')]
+        public PersonalData $personal,
+        #[SerializedName('tickets')]
+        public array $tickets,
+    ) {
+    }
+}