feat: Add new StoredObjectManager service.

To read and write onto `StoredObject` document using a common interface.

src/Bundle/ChillDocStoreBundle/Exception/StoredObjectManagerException.php

@@ -0,0 +1,40 @@
+<?php
+
+/**
+ * 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.
+ */
+
+declare(strict_types=1);
+
+namespace Chill\DocStoreBundle\Exception;
+
+use Exception;
+use Throwable;
+
+final class StoredObjectManagerException extends Exception
+{
+    public static function errorDuringHttpRequest(Throwable $exception): self
+    {
+        return new self('Error during HTTP request.', 500, $exception);
+    }
+
+    public static function invalidStatusCode(int $code): self
+    {
+        return new self(
+            sprintf('Invalid status code received (%s).', $code)
+        );
+    }
+
+    public static function unableToDecrypt(string $message): self
+    {
+        return new self(sprintf('Unable to decrypt content (reason: %s).', $message));
+    }
+
+    public static function unableToGetResponseContent(Throwable $exception): self
+    {
+        return new self('Unable to get content from response.', 500, $exception);
+    }
+}