[node] Add streaming support for vc dev (#9745)

Until now, the user code response it's buffered and serialized. This is
mismatching how Vercel works these days.

This PR enables streaming response in `vc dev` for Edge/Serverless.

As part of the implementation, the `node-bridge` which spawns a process
to consume the user code is not necessary anymore.

Some necessary files (like HTTP server helpers) have been moved to live
in node builder package instead.

---------

Co-authored-by: Ethan Arrowood <ethan.arrowood@vercel.com>
Co-authored-by: Sean Massa <EndangeredMassa@gmail.com>

packages/cli/test/dev/fixtures/serverless-function/api/index.js

@@ -0,0 +1,7 @@
+module.exports = (req, res) => {
+  res.json({
+    url: req.url,
+    method: req.method,
+    headers: req.headers,
+  })
+}