Webpack v5 removed polyfils for core modules

[raduciobanu22]

Issue description:

In the most recent version webpack removed polyfills for core modules which now need to be manually configured. create-react-app uses webpack v5 and developers building a Dapp using it will see their build failing if pact-lang-api is used as a dependency.

Solution:

1. Eject the create-react-app config or use react-app-rewired
2. Install missing deps (https-browserify, stream-http, buffer)
3. Adjust the webpack config file

....
fallback: {
     https: require.resolve("https-browserify"),
     http: require.resolve("stream-http"),
     buffer: require.resolve("buffer")
},