[Feature request] Support Argon2

[absar]

In 2021 it is urgent than ever to support Argon2. Unfortunately this very useful library doesn't support anyone of the modern password hashing algorithms like Argon2, bcrypt, scrypt, and PBKDF2. There is a recent implementation of Argon2 in pointycastle library however it doesn't seem to be mature enough for production use.

[natebosch]

I'll leave this open as a feature request. I think this is not likely to be prioritized by the Dart team.