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This is a new interface that allows the caller to provide a
multi-threading implementation. It's defined in terms of a new `Join`
trait, for which we provide two implementations, `SerialJoin` and
`RayonJoin`. This lets the caller control when multi-threading is used,
rather than the previous all-or-nothing design of the "rayon" feature.
Although existing callers should keep working, this is a compatibility
break, because callers who were relying on automatic multi-threading
before will now be single-threaded. Thus the next release of this crate
will need to be version 0.2.
See https://github.com/BLAKE3-team/BLAKE3/issues/25 and
https://github.com/BLAKE3-team/BLAKE3/issues/54.
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