ACVP: Consider adding preHash/external-mu test cases

[mkannwischer]

FIPS-204 has a preHashing mode that passes a hash of the message instead of the full message.

ACVP has test cases for the preHash mode with the external hash being one of
"SHA2-224", "SHA2-256", "SHA2-384", "SHA2-512", "SHA2-512/224", "SHA2-512/256", "SHA3-224", "SHA3-256", "SHA3-384", "SHA3-512", "SHAKE-128", "SHAKE-256".

Currently these test cases are being skipped as the current code does not support pre-hashing.
Do we want to support pre-hashing?

It is also allowed to compute the entirety of mu <- H(BytesToBits(𝑡𝑟)||𝑀′, 64) externally.

[jakemas]

Yes! I think we should add pre-hash modes. I plan to implement external mu.