Move node polyfills in webpack to prepare for webpack 5

Created by: andriijas

I've started to work on webpack 5 in CRA and I will make a draft PR soon.

Webpack 5 removes automatic node.js polyfills (Concerns: Link mentions automatic pollyfill removal might not make it to final release depending on community feedback)

In preparation for that I replaced the webpack polyfill with a 3rd party. https://github.com/browserify/path-browserify/