Add `target: "universal"`

[ahabhgk]

Same as https://github.com/webpack/webpack/issues/6525

• runtime code that can run in web, webworker and node.js, runtime code can be a bit bigger.
• chunks can shared between web, webworker, and node.js (an universal chunkFormat).

If you want to implement this, we encourage you also contribute this back to webpack.

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