Implement asynchronous upload feature in Openstack Object Store

Those features were previously stored in champs-libres/async-upload-bundle

This commit introduces several new classes within the ChillDocStore bundle for handling asynchronous uploads onto an Openstack Object Store. Specifically, the TempUrlOpenstackGenerator, SignedUrl, TempUrlGeneratorInterface, TempUrlGenerateEvent, and TempUrlGeneratorException classes have been created.

This implementation will allow for generating "temporary URLs", which assist in securely and temporarily uploading resources to the OpenStack Object Store. This feature enables the handling of file uploads in a more scalable and efficient manner in high-volume environments.

Additionally, corresponding unit tests have also been added to ensure the accuracy of this new feature.

src/Bundle/ChillDocStoreBundle/AsyncUpload/SignedUrl.php

@@ -0,0 +1,21 @@
+<?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\AsyncUpload;
+
+readonly class SignedUrl
+{
+    public function __construct(
+        public string $method,
+        public string $url,
+        public \DateTimeImmutable $expires,
+    ) {}
+}