feat: simplify export format and use tsup for building

[jmike]

Adopt a new export format. Target esm and cjs but don't polyfill for the browser.

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Latest commit: f9481b2

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[thanoskrg]

Nice one 👌

One for later, let's also add a CI run for Node v22 which is the LTS version. I noticed our current actions use Node v20.