[stdlib and samples][rename] konan -> kotlin.native

samples/workers/src/main/kotlin/Workers.kt

@@ -1,4 +1,4 @@
-import konan.worker.*
+import kotlin.native.worker.*
 
 data class WorkerArgument(val intParam: Int, val stringParam: String)
 data class WorkerResult(val intResult: Int, val stringResult: String)