Fixed bugs

• Link only generated Java and Kotlin to compilation task by default (#375). Fixes the issue in projects with no Java/Kotlin code (with Java plugin applied, maybe implicitly, such as the Scala plugin) that compileJava task is triggered with "no source files" error.
• Support packaging and extracting protos in Android aar (#440, #443). Functionalities of importing protos from Android AAR dependencies is broken in the previous release. It is fixed now.
• Avoid storing variantName property in the task (#448). Fixes the issue of internal warning being triggered by Gradle's configuration caching trying to serialize properties in GenerateProtoTask.

Thanks to contributors

• @gavra0