Add quick fix to replace all 'class object's in project

idea/testData/quickfix/migration/classObjectToDefaultMultiple.before.Main.kt

@@ -0,0 +1,19 @@
+// "Replace 'class' keyword with 'default' modifier in whole project" "true"
+
+class A {
+    public class<caret> object {
+
+    }
+}
+
+class B {
+    class object {
+
+    }
+}
+
+class C {
+    class object Named {
+
+    }
+}