Provide KSP Plugin API to expose KSP task names for other plugins

In the Room Gradle Plugin we pass annotation processor options based on the Android variant target or KMP target and we do that by [finding the corresponding KSP task of the Android variant or Kotlin Compile task](https://cs.android.com/androidx/platform/frameworks/support/+/androidx-main:room/room-gradle-plugin/src/main/java/androidx/room/gradle/integration/KotlinMultiplatformPluginIntegration.kt;l=111) using the same naming strategy as KSP. But this can be brittle and break Room if one day the KSP plugin decides to use a different naming convention. It would be nice if the KSP Plugin offered a small API with the naming convention used.