Support Apache Shiro Argon2 hash encoding

[solardiz]

https://shiro.apache.org/cryptography-features.html uses Argon2id hashes, but encodes them subtly differently. Test vectors from CMIYC 2024 cracks:

$shiro2$argon2id$v=19$t=1,m=65536,p=4$z0RJt6Ddj3RwojqdC7ldPw$GlQ2aON2k6zNEIAVUgxounobxAFbpPXh8dQkPFUvexM
$shiro2$argon2id$v=19$t=1,m=65536,p=4$2IbMDqCmh/5RI5sVZzMdUw$fwqL7fb+UY2MDL2r4QXGGExJwK05yxolYjnY1xlFje0

were after a sed crackable by our argon2-opencl like this:

$argon2id$v=19$m=65536,t=1,p=4$z0RJt6Ddj3RwojqdC7ldPw$GlQ2aON2k6zNEIAVUgxounobxAFbpPXh8dQkPFUvexM:Aditya@2011
$argon2id$v=19$m=65536,t=1,p=4$2IbMDqCmh/5RI5sVZzMdUw$fwqL7fb+UY2MDL2r4QXGGExJwK05yxolYjnY1xlFje0:Aarush@01

We could want to add a split() or prepare() to remove the $shiro2 and put m and t in the canonical order. Alternatively, for the latter we could patch upstream Argon2 code not to insist on the order, but then there would be more than one representation of the same hash in john.pot, which is undesirable.