chore(a2a-server): refactor a2a-server src directory (#7593)

packages/a2a-server/src/http/requestStorage.ts

@@ -0,0 +1,10 @@
+/**
+ * @license
+ * Copyright 2025 Google LLC
+ * SPDX-License-Identifier: Apache-2.0
+ */
+
+import type express from 'express';
+import { AsyncLocalStorage } from 'node:async_hooks';
+
+export const requestStorage = new AsyncLocalStorage<{ req: express.Request }>();