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Add TransformableFuture.combined

Please do not merge yet. Needs tests. Feel free to comment though.

This allows, among other things, for message implementations to share
logic with types that produce TransformableFutures, and combine
additional work on top of that. Put in other words, it allows any of
our Future based APIs to be implemented with any number of Futures
internally if they needed (rare but happens), as long as they are
returned combined.

The semantics of a combined future is [hopefully] what you would expect,
and follows Guava's Futures.allAsList. For example, cancel cancels all
futures, isCancelled returns true if any of the futures are cancelled,
isDone returns true only if all of the futures are done, etc.

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