Compilation avoidance for Kotlin DSL scripts

[bamboo]

Kotlin DSL should recognize ABI (Application Binary Interface) breaking changes, and trigger recompilation of scripts only in that case.

This wouldn't change the feedback loop duration for API changes in buildSrc, but for a non-API change it would short-circuit all build scripts compilation, shortening the feedback loop. On builds with lots of scripts the effect would be dramatic.

[eskatos]

The existing org.jetbrains.kotlin.jvm.abi Kotlin compiler plugin, see KT-25128, isn't suitable for use in script compilation as it works at compilation time and can't be used after the fact on dependencies. There's no planned work on this to make it usable for us.

Another option would be to start with what we already have for generic JVM bytecode ABI extraction, maybe AbiExtractingClasspathResourceHasher. This should already provide some compilation avoidance. It could then be incrementally augmented to understand Kotlin idioms.

[stale]

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[ZacSweers]

Commenting because this is actually important

[eskatos]

See #14735