Implement creator studio and upload updates

app/Services/Sitemaps/ShardableSitemapBuilder.php

@@ -0,0 +1,21 @@
+<?php
+
+declare(strict_types=1);
+
+namespace App\Services\Sitemaps;
+
+use DateTimeInterface;
+
+interface ShardableSitemapBuilder extends SitemapBuilder
+{
+    public function totalItems(): int;
+
+    public function shardSize(): int;
+
+    /**
+     * @return list<SitemapUrl>
+     */
+    public function itemsForShard(int $shard): array;
+
+    public function lastModifiedForShard(int $shard): ?DateTimeInterface;
+}