Accept Stream<T> in collection-like builder fields

Since Conjure always makes a defensive copy and the element type may need conversion, accepting only Iterable<T> encourages creation of a "waste" copy:

Bean bean = Bean.builder()
        .values(myValues.stream().map(Converter::convert).collect(toList()))
        .build();

Instead, this could accept the stream directly, use .forEachOrdered and avoid the extra copy:

Bean bean = Bean.builder()
        .values(myValues.stream().map(Converter::convert))
        .build();

No source file or test is named. Start by locating the generator path that creates collection-like builder fields and read how Iterable inputs are handled; confirm the generated builders accept Stream and preserve ordered consumption without the caller's intermediate copy.