Review use of node APIs

[tylerbutler]

This issue is to track the work related to fully addressing #8725. I'm opening a new issue since #8725 has a lot of discussion on it already.

Issues

• List of all node libraries used in repo code #9508
• Routerlicious driver is not compatible with Webpack 5 #4843
• Use built-in fetch() in Browsers and node-fetch in Node #9443
• Document that process needs to be polyfilled with Webpack 5 due to util transitive dependency #10225

Next

• Review list and decide, for each, what the "policy" should be for the library.
• Look at complete dependency chain for the 3P libraries and ensure they're all implicit-dependency free.
• Use the browser field instead of main for packages that are intended to run in the browser (e.g. examples, anything that uses webpack in the build).

Policy options

1. We shouldn't use the library -- either replace it with an isomorphic implementation, add explicit polyfill dependencies, or remove usage completely.
2. Using the library in test code is ok. Usage of the node libraries should be explicitly identified.