Migration to actual/expect: quick-fix CreateActualFix with tests

idea/testData/multiModuleQuickFix/enum/header/header.kt

@@ -1,4 +1,4 @@
-// "Create header class implementation for platform JS" "true"
+// "Create actual class for platform JS" "true"
 
 header enum class <caret>MyEnum {
     FIRST,

idea/testData/multiModuleQuickFix/enum/header/header.kt.after

@@ -1,4 +1,4 @@
-// "Create header class implementation for platform JS" "true"
+// "Create actual class for platform JS" "true"
 
 header enum class MyEnum {
     FIRST,

idea/testData/multiModuleQuickFix/enum/js/MyEnum.kt.after

@@ -1,10 +1,10 @@
 // MyEnum: to be implemented
-impl enum class MyEnum {
+actual enum class MyEnum {
     FIRST,
     SECOND,
     LAST;
 
-    impl val num: Int
+    actual val num: Int
         get() = TODO("not implemented") //To change body of created functions use File | Settings | File Templates.
 
 }