fix: request download and upload not support responseReturn (#5456)

* fix: request download and upload not support `responseReturn`

* docs: update

* fix: type of request client upload result

playground/src/api/examples/download.ts

@@ -0,0 +1,28 @@
+import type { RequestResponse } from '@vben/request';
+
+import { requestClient } from '../request';
+
+/**
+ * 下载文件，获取Blob
+ * @returns Blob
+ */
+async function downloadFile1() {
+  return requestClient.download<Blob>(
+    'https://unpkg.com/@vbenjs/static-source@0.1.7/source/logo-v1.webp',
+  );
+}
+
+/**
+ * 下载文件，获取完整的Response
+ * @returns RequestResponse<Blob>
+ */
+async function downloadFile2() {
+  return requestClient.download<RequestResponse<Blob>>(
+    'https://unpkg.com/@vbenjs/static-source@0.1.7/source/logo-v1.webp',
+    {
+      responseReturn: 'raw',
+    },
+  );
+}
+
+export { downloadFile1, downloadFile2 };