Change SelectAll iterators to return stream instead of StreamFuture #2431
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The conversion from StreamFuture to the underlying stream always succeeds because FuturesUnordered removes completed futures. So, I think it makes sense and more useful that SelectAll iterators return stream instead of StreamFuture.
This also removes iter_pin_ref and iter_pin_mut, because SelectAll's streams are always Unpin.
cc #1964, #2428
FYI @ibraheemdev