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With the addition of records, it now makes sense to create an API for parallelizing of futures of different types, like `Future.wait` does for collections of same-typed futures. The `wait` getters here apply to tuples of 2-9 futures of distinct types, which should be enough for most reasonable uses. Planned addition for Dart 3.0. CoreLibraryReviewExempt: Everybody's on vacation, everybody everywhere. Change-Id: Iaa814e02e2274082bb8a29b9a18b4930bcc953bb Reviewed-on: https://dart-review.googlesource.com/c/sdk/+/288903 Reviewed-by: Nate Bosch <nbosch@google.com> Reviewed-by: Martin Kustermann <kustermann@google.com> Commit-Queue: Lasse Nielsen <lrn@google.com>