add ultra-light classes/members that work without backend in simple cases

compiler/testData/asJava/ultraLightClasses/implementingKotlinCollections.kt

@@ -0,0 +1,27 @@
+import java.util.*
+
+/** should load cls */
+class MyList : List<String> {
+  override operator fun get(index: Int): String {}
+}
+
+/** should load cls */
+interface ASet<T> : MutableCollection<T> {}
+
+/** should load cls */
+abstract class MySet<T> : ASet<T> {
+  override fun remove(elem: String): Boolean {}
+
+}
+
+/** should load cls */
+abstract class SmartSet<T> private constructor() : AbstractSet<T>() {
+  override fun iterator(): MutableIterator<T> = unresolved
+
+  override fun add(element: T): Boolean {
+    return true
+  }
+
+  override fun contains(element: T): Boolean = true
+
+}