Remove obsolete files, restructure

src/UUIDGenerator.php

@@ -0,0 +1,16 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Stancl\Tenancy;
+
+use Ramsey\Uuid\Uuid;
+use Stancl\Tenancy\Contracts\UniqueIdentifierGenerator;
+
+class UUIDGenerator implements UniqueIdentifierGenerator
+{
+    public static function generate($resource): string
+    {
+        return Uuid::uuid4()->toString();
+    }
+}