Implement "Override hierarchy" view

idea/testData/hierarchy/overrides/kotlinFunctionInClass/KotlinFunctionInClass_verification.xml

@@ -0,0 +1,12 @@
+<node text="T  ()" base="true">
+  <node text="B  ()"/>
+  <node text="X  ()"/>
+  <node text="Y  ()">
+    <node text="A  ()">
+      <node text="C  ()"/>
+    </node>
+    <node text="Z  ()">
+      <node text="D  ()"/>
+    </node>
+  </node>
+</node>

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

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

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

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