Support for building CJS modules

[atifsyedali]

Checklist

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Feature Description

Please output two versions -- CJS and ESM -- in the shipped libraries and remove the type: module flag from package.json.

I don't think this is a breaking change as you are only adding a new output variant. Existing systems that rely on ESM will continue to work the same way.

Visual Mockups

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[arshaw]

this has been implemented in master. i'll write a comment here when i release

[arshaw]

There is now a commonjs file in each package, main.cjs.js and now it's hooked up to the main field in package.json whereas the esm file is the module field. As of 5.4.0