Remove allocation in slh-dsa #860
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This PR takes care of some TODO's in the sign and verify functions in the slh-dsa crate, thereby resolving #854
I'm passing the new messages parts on the stack as slice references down into the functions h_msg and prf_msg so that each part can be .update()'ed into the digest without having to copy them into new memory. I think it could be improved with some type system wizardry to enforce the layout specified in FIPS 205, but that's a bit beyond my abilities.