Make isFromJava check work for SAM adapter extension descriptors (KT-21538)

Consider all callable descriptor in JavaClassDescriptor to be from Java.

This is used to check if smart step into should be intercepted by Kotlin
handler or delegated to Java.

 #KT-21538 Fixed

idea/testData/debugger/tinyApp/src/stepping/stepIntoAndSmartStepInto/javaSamFunction.kt

@@ -0,0 +1,9 @@
+package javaSamFunction
+
+import forTests.MyJavaClass
+
+fun main(args: Array<String>) {
+    val klass = MyJavaClass()
+    //Breakpoint!
+    klass.other { /* do nothing*/ }
+}