Introduce npm workspaces and turborepo

[michaelrivet]

Enterprise companies tend to be large and their repo contains lots of code. The current starter kit has a single build process that will not scale well for larger companies.

NPM workspaces and Turborepo both address this issue. It'd allow for only the changed code to be validated while others are cached.
https://docs.npmjs.com/cli/v7/using-npm/workspaces
https://docs.npmjs.com/cli/v7/using-npm/workspaces