Create subclass intention implemented #KT-8473 Fixed

Can be used for implementing interfaces / abstract classes / sealed classes or extending open classes

idea/testData/quickfix/implement/protected.kt.after

@@ -0,0 +1,7 @@
+// "Implement abstract class" "true"
+// SHOULD_BE_AVAILABLE_AFTER_EXECUTION
+
+class Container {
+    protected abstract class Base
+    protected class BaseImpl : Base()
+}