LibRequests: Add a forwarding header

Author: https://github.com/trflynn89
Commit: https://github.com/LadybirdBrowser/ladybird/commit/3de86cf0fa1
Pull-request: https://github.com/LadybirdBrowser/ladybird/pull/1671

Userland/Libraries/LibRequests/Forward.h

@@ -0,0 +1,15 @@
+/*
+ * Copyright (c) 2024, Tim Flynn <trflynn89@ladybird.org>
+ *
+ * SPDX-License-Identifier: BSD-2-Clause
+ */
+
+#pragma once
+
+namespace Requests {
+
+class Request;
+class RequestClient;
+class WebSocket;
+
+}