feat(client/worker): support web work in frontend with fallback (#31)

* feat(client/web): add upload mgr

* feat(uploader): move uploader to worker

* feat(upload_mgr): use native worker for uploading

* fix(upload_mgr): fix uploading stop not working

* chore(client/web): cleanups

* test(upload.worker): add unit test for upload.worker

* feat(worker): add foreground upload worker

* chore(uploader): turn down the speedup

src/client/web/webpack.app.dev.js

@@ -5,8 +5,13 @@ const dev = require("./webpack.dev.js");
 
 module.exports = merge(dev, {
   entry: "./src/app.tsx",
+  // entry: [
+  //   "./src/app.tsx",
+  //   "./src/worker/uploader.worker.ts",
+  // ],
   context: `${__dirname}`,
   output: {
+    globalObject: "this",
     path: `${__dirname}/../../../public/static`,
     chunkFilename: "[name].bundle.js",
     filename: "[name].bundle.js"