Implement "Override hierarchy" view

idea/testData/hierarchy/overrides/javaMethodInInterface/main1.kt

@@ -0,0 +1,27 @@
+trait T: A {
+    override fun foo() {
+
+    }
+}
+
+open class X: A {
+    override fun foo() {
+
+    }
+}
+
+open class Y: T {
+    override fun foo() {
+
+    }
+}
+
+open class Z: X() {
+    override fun foo() {
+
+    }
+}
+
+class SS {
+
+}