Move to a monorepo layout so we can add example apps

[kumar303]

I'd like to start adding real world example apps like create-react-app and react-native / Expo. These will help us prove out the interface and showcase features.

To do this, we should re-organize into a monorepo. I was thinking yarn workspaces? I'm open to lerna as well, whatever works. My only experience is with lerna and I'm kind of meh on it.

This ticket is about moving the current module to a sub-package and setting everything up (testing, linting, storybook). We can add the actual example apps later. Maybe it would be better to add tsdx first since I think that has monorepo (lerna?) support.

[kumar303]

Actually, it sounds like lerna is the way to go in combination with yarn. I guess lerna uses yarn workspaces under the hood.