refactor: add DTO class to validate schema

src/Dto/Connector/GandiProviderDto.php

@@ -0,0 +1,13 @@
+<?php
+
+namespace App\Dto\Connector;
+
+use Symfony\Component\Validator\Constraints as Assert;
+
+final class GandiProviderDto extends DefaultProviderDto
+{
+    #[Assert\NotBlank]
+    public string $token;
+
+    public ?string $sharingId = null;
+}