Implement rendering of raw types

Also add some clarification in spec

idea/testData/codeInsight/overrideImplement/implementJavaRawSubclass/foo/A.java

@@ -0,0 +1,5 @@
+package foo;
+
+public abstract class A implements B {
+
+}

idea/testData/codeInsight/overrideImplement/implementJavaRawSubclass/foo/B.java

@@ -0,0 +1,6 @@
+package foo;
+import java.util.*;
+
+public interface B<T> {
+    B<String> foo(List<String> x, String y);
+}

idea/testData/codeInsight/overrideImplement/implementJavaRawSubclass/foo/Impl.kt

@@ -0,0 +1,5 @@
+import foo.A
+
+class C : A() {
+    <caret>
+}

idea/testData/codeInsight/overrideImplement/implementJavaRawSubclass/foo/Impl.kt.after

@@ -0,0 +1,8 @@
+import foo.A
+import foo.B
+
+class C : A() {
+    override fun foo(x: MutableList<Any?>?, y: String?): B<*>? {
+        <selection><caret>throw UnsupportedOperationException()</selection>
+    }
+}