Feature request: Add the BLAKE3 cryptographic hash

[marknelsonengineer-student]

BLAKE3 was introduced just a few years ago: https://en.wikipedia.org/wiki/BLAKE_(hash_function)#BLAKE3

It appears to be a promising algorithm and I'd like to use it for some research that may turn into an RFC someday.

There's a reference implementation here: https://github.com/BLAKE3-team/BLAKE3

Thank you for implementing Issue #523 and adding BLAKE2.