EA-219152 (partially): Support KClass 'unboxing' in debugger

KClass can be 'unboxed' to a plain Java class. Debugger should be aware of this.
Unfortunately, this commit is not enough to fully support this scenario, as it's impossible to invoke KClass methods/extension on java.lang.Class instance. There should be an additional diagnostic that will forbid such calls.

idea/jvm-debugger/jvm-debugger-test/testData/evaluation/singleBreakpoint/kClass.kt

@@ -0,0 +1,23 @@
+package test
+
+class Foo
+
+fun main() {
+    val cls = Foo::class
+    val cls2 = Foo::class
+    val cls3 = Foo::class.java
+
+    //Breakpoint!
+    foo(cls2)
+}
+
+private fun foo(a: Any?) {}
+
+// EXPRESSION: cls
+// RESULT: instance of java.lang.Class(reflected class=test.Foo, id=ID): Ljava/lang/Class;
+
+// EXPRESSION: cls2
+// RESULT: instance of kotlin.jvm.internal.ClassReference(id=ID): Lkotlin/jvm/internal/ClassReference;
+
+// EXPRESSION: cls3
+// RESULT: instance of java.lang.Class(reflected class=test.Foo, id=ID): Ljava/lang/Class;