Fix invalid exports by changing package type

[timolins]

📓 What's in there?

Our build output didn't align with what's stated in the package.json. This change, makes the ESM file the default, and outputs ".cjs" for CommonJS. tsup docs for reference.

This also aligns with how it works in Web Analytics.

[vercel[bot]]

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Name	Status	Preview	Comments	Updated (UTC)
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[tobiaslins]

We removed type: module before. Context:

• https://vercel.slack.com/archives/C02UZSM1CP6/p1697545119066629
• https://vercel.slack.com/archives/C04DUD7EB1B/p1697576563771229?thread_ts=1697146531.305779&cid=C04DUD7EB1B https://github.com/vercel/speed-insights/pull/12

[feugy]

Closing in favor of #17

Thanks for the work done!