Add form and types to handle async files

src/Bundle/ChillDocStoreBundle/Validator/Constraints/AsyncFileExists.php

@@ -0,0 +1,32 @@
+<?php
+
+declare(strict_types=1);
+
+/*
+ * Chill is a software for social workers
+ *
+ * For the full copyright and license information, please view
+ * the LICENSE file that was distributed with this source code.
+ */
+
+namespace Chill\DocStoreBundle\Validator\Constraints;
+
+use Symfony\Component\Validator\Constraint;
+
+/**
+ * @Annotation
+ */
+final class AsyncFileExists extends Constraint
+{
+    public string $message = "The file '{{ filename }}' is not stored properly.";
+
+    public function validatedBy()
+    {
+        return AsyncFileExistsValidator::class;
+    }
+
+    public function getTargets()
+    {
+        return [Constraint::CLASS_CONSTRAINT, Constraint::PROPERTY_CONSTRAINT];
+    }
+}