Split out definitions into separate files

[jonaslagoni]

Reason/Context

To make it more digestible and easier to pinpoint problems, I think it would make sense to split each definition into separate files.

Description

That said, I also see benefits in bundling all these separate definitions into one file. This way it remains easy to use in other settings, where you don't need all the separate files.

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🎉 This issue has been resolved in version 3.0.0-next-major.1 🎉

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