Update to K2

[ZacSweers]

• KSP tests with and without KSP2
• Need to learn more about @UnsafeDuringIrConstructionAPI

[ZacSweers]

KSP2 support blocked by google/ksp#1643

[ZacSweers]

I've released 0.26.0-alpha01 with the changes in the PR up to this point

Notes

• Targets Kotlin 2.0.0-Beta3 and KSP 2.0.0-Beta3-1.0.17.
• moshi-sealed KSP does not work in KSP2 yet as KSP2 doesn't yet support exposing sealed subclasses to processors. moshi-ir's sealed support should work fine
• proguard rule gen should work in KSP2, but not for moshi-sealed types

[ZacSweers]

I've published 0.26.0-alpha02 with the changes up to this point and targeting Beta5. Note that KSP2 still doesn't support sealed subclasses yet.

[ZacSweers]

I've published 0.26.0-alpha03 with the changes up to this point. This targets Kotlin 2.0.0-RC1 and KSP 2.0.0-RC1-1.0.20. This also migrates the project to the soon-to-be-stable new kotlin-metadata artifact (from kotlinx-metadata). This should make this library feature complete with everything coming in K2 and KSP2 🤞.

[ZacSweers]

Published 0.27.0-alpha01 with RC3 and the latest changes from main. Note there's no KSP update for RC3 yet