Support KSP

[dzikoysk]

~ https://github.com/google/ksp

[dzikoysk]

KSP won't be stable enough for our ecosystem in the near future, the JetBrains' statement about kapt being in maintenance mode is a meme irrational having such issues unresolved for years:

• Debugging support google/ksp#31
• IDE not indexing generated source google/ksp#37
• support for repeatable annotations google/ksp#358
• KSP read classpath resource google/ksp#431
• How would I use "Kotlin Symbol Processing API" from maven google/ksp#47
• [...] And much more to be fair - mostly bugs with basic operations

Closing this for now as moving to KSP is not an option.