Move .java and .kotlin extension properties to kotlin.jvm

Delete the old ones in package kotlin.reflect.jvm because otherwise the code
using those functions will become red in a lot less meaningful way (overload
resolution ambiguity) than if they're deleted (unresolved import)

Based on the work originally done by @dnpetrov

 #KT-8380 Fixed

compiler/testData/integration/smoke/scriptWithClasspath/script.kts

@@ -1,3 +1,3 @@
 import javax.inject.Inject
 
-println(javaClass<Inject>())
+println(Inject::class.java)