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And, make a package which can be imported to register "all" of the
multihashes.  (Or at least all of them that you would've expected
from go-multihash.)

There are also packages that are split roughly per the transitive
dependency it brings in, so you can pick and choose.

This cascaded into more work than I might've expected.
Turns out a handful of the things we have multihash identifiers for
actually *do not* implement the standard hash.Hash contract at all.
For these, I've made small shims.

Test fixtures across the library switch to using sha2-512.
Previously I had written a bunch of them to use sha3 variants,
but since that is not in the standard library, I'm going to move away
from that so as not to re-bloat the transitive dependency tree
just for the tests and examples.