feat: export all user Memos as a .zip of Markdown files (#2854)

* Add gRPC Memos Export

* Update code style

* Add URL.revokeObjectURL

* Rename protobuf and ESLint fix

* Change MemosExport to ExportMemos

web/src/helpers/utils.ts

@@ -92,3 +92,11 @@ export const isValidUrl = (url: string): boolean => {
     return false;
   }
 };
+
+export const downloadFileFromUrl = (url: string, filename: string) => {
+  const a = document.createElement("a");
+  a.href = url;
+  a.download = filename;
+  a.click();
+  a.remove();
+};