I was trying to migrate build.gradle files to use Kotlin DSL. Using the plugins block instead of apply (legacy, apparently) doesn't seem to be as straightforward as suggested. Since "com.google.firebase.appdistribution", "com.google.firebase.crashlytics", and "com.google.gms.google-services" are missing in the Gradle plugin portal (?). Can I not use them in the plugin block? I tried this but it didn't seem to work. Also, why are they missing? I still don't quite understand how this works so please bear with me.