Implement "Override hierarchy" view

idea/testData/hierarchy/overrides/kotlinFunctionInTrait/KotlinFunctionInTrait_verification.xml

@@ -0,0 +1,13 @@
+<node text="T  ()" base="true">
+  <node text="A  ()">
+    <node text="C  ()"/>
+  </node>
+  <node text="B  ()">
+    <node text="Y  ()"/>
+  </node>
+  <node text="X  ()">
+    <node text="Z  ()">
+      <node text="D  ()"/>
+    </node>
+  </node>
+</node>

idea/testData/hierarchy/overrides/kotlinFunctionInTrait/main0.kt

@@ -0,0 +1,25 @@
+trait T {
+    fun <caret>foo()
+}
+
+open class X: T {
+    override fun foo() {
+
+    }
+}
+
+open class Y: B() {
+    override fun foo() {
+
+    }
+}
+
+open class Z: X() {
+    override fun foo() {
+
+    }
+}
+
+class SS {
+
+}

idea/testData/hierarchy/overrides/kotlinFunctionInTrait/main1.java

@@ -0,0 +1,29 @@
+interface A extends T {
+    @Override
+    public void foo();
+}
+
+class B implements T {
+    @Override
+    public void foo() {
+
+    }
+}
+
+class C implements A {
+    @Override
+    public void foo() {
+
+    }
+}
+
+class D extends Z {
+    @Override
+    public void foo() {
+
+    }
+}
+
+class S {
+
+}