Gradle Plugin: Support isolated projects

[hfhbd]

• Replace findProperty with providers.gradleProperty
• Ideally, KGP adds more provider (and DomainCollection) APIs instead Observable/Lazy, ConfigurationAwareProvider...

[hfhbd]

Can you please reopen this issue? I still get two issues when using 2.0.20-1.0.25-SNAPSHOT:

• [ ] https://github.com/google/ksp/blob/429f173a3f77836a70a41d633c0a680a7c55aa5e/gradle-plugin/src/main/kotlin/com/google/devtools/ksp/gradle/KspSubplugin.kt#L901
• [ ] https://github.com/google/ksp/blob/429f173a3f77836a70a41d633c0a680a7c55aa5e/gradle-plugin/src/main/kotlin/com/google/devtools/ksp/gradle/KspSubplugin.kt#L349

Basically, you can't fetch the tasks list from the dependencies: org.gradle.api.InvalidUserCodeException: Project ':foo' cannot access task dependencies directly if you use a multi module setup :foo that depends on :bar using implementation given a Kotlin/JVM project.