feat: new cjs and esm bundles for core

[barak007]

This PR adds two bundles to the dist of @stylable/core.

• stylable.lib.cjs - to be able to run in playground with commonjs module system
• stylable.lib.esm - to be able to run in browsers via import

I didn't add the files anywhere in the package json just emitting the files to dist. also didn't output global iife bundle.

I removed from enhanced-resolve and made it mandatory to pass resolveModule to Stylable (only in the bundle). We want to remove the default resolver anyhow in the next major.
I also moved stylable-js-module-source to core since it's the missing peace to a full transform of Stylable modules without any other packages.

This adds mothing to the build time for both bundles.
we might want to consider running the entire build with esbuild.

[idoros]

I didn't add the files anywhere in the package json just emitting the files to dist. also didn't output global iife bundle.

maybe open an issue for the next major to collect the external API we want to expose in exports