Remove hard dependency on Kotlin

Closes gh-9811

Author: eleftherias

gradle.properties

@@ -7,3 +7,4 @@ kotlinVersion=1.5.0
 org.gradle.jvmargs=-Xmx3g -XX:MaxPermSize=2048m -XX:+HeapDumpOnOutOfMemoryError
 org.gradle.parallel=true
 org.gradle.caching=true
+kotlin.stdlib.default.dependency=false