Add "Find Usages" tests for local classes/objects

idea/testData/findUsages/java/findJavaClassUsages/JKInterfaceDerivedLocalClasses.1.kt

@@ -0,0 +1,11 @@
+fun foo() {
+    open class X: A
+
+    trait T: A
+
+    fun bar() {
+        public open class Y: X()
+
+        public class Z: T
+    }
+}