generate "add" method for collections

[Max Rydahl Andersen]

given this:

record Rule(String name, Filter filter, List<Action>) {}

I would love I could do:

RuleBuilder.name("arule").filter(f().from("[e-mail]")).action(markAsSeen()).action(fileTo("folder")).build()

Basically, in addition to generating action(List<Action>) add a action(Action) that builds up the list.

[Jordan Zimmerman]

Add this:

@RecordBuilder.Options(addSingleItemCollectionBuilders = true, useImmutableCollections = true)