Create TrailingCommaIntention

#KT-34744

idea/testData/quickfix/replaceWithSafeCallForScopeFunction/letWithWrongImplicitThis.kt

@@ -7,6 +7,7 @@
 // ACTION: Specify explicit lambda signature
 // ACTION: Add return@let
 // ACTION: Convert to single-line lambda
+// ACTION: Enable a trailing comma by default in the formatter
 // ERROR: Only safe (?.) or non-null asserted (!!.) calls are allowed on a nullable receiver of type String?
 
 fun String?.foo(a: String?) {