Update to Dokka 2.0.0 (beta)

[Jolanrensen]

Korro is still based on Dokka/Kotlin 1.8.20. Now Kotlin 2.0 has been out a while, it's getting more and more out of date. Especially when new language features are being introduced.

I faced the same issue for my documentation preprocessor which also uses Dokka under the hood for the Gradle plugin. However, after a lot of trial and error, I managed to update it to Dokka 2.0.0-Beta, which uses Kotlin 2.0.20 to parse your project files. Dokka 2.0.0 should be released soon, but it doesn't hurt to prepare for it with the beta version already :).

You can see my PR for inspiration, but at the end of the day, not much had to change, just some util functions (which I stole borrowed from Dokka).

You can also decide to go the route of #9 but I found it very difficult to initiate the Kotlin Analysis API from Gradle. Dokka already handles this for us atm.

[devcrocod]

@Jolanrensen are there any issues in the dataframe related to the outfdated of Korro?

[Jolanrensen]

As of now, not yet, so there's no big hurry. However, when we would start using a language feature of Kotlin 2.0+ in the example it would break.