The old API was too specific for the Kotlin internal use cases and
leaked some abstractions due to the missing target-compilation project
model. One of such leaking abstractions was the Gradle tasks being
exposed to the subplugin, which required the tasks to instantiate
in order for the subplugin to apply. This violated task configuration
avoidance, so the old API could never work in compliance with TCA.
Introduce the new KotlinCompilerPluginSupportPlugin API that uses the
compilations instead of the tasks and is TCA-compliant.
Sergey Igushkin
96ed30a449