password-hash: extract CustomizedPasswordHasher trait
#2105
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Splits out
PasswordHasher::hash_password_customizedinto its own separateCustomizedPasswordHashertrait.This trait retains the associated
Paramstype since that's used as a method argument.This also adds a type alias
Versionforu32to use in place ofDecimal(also au32alias) for theVersionparameter tohash_password_customized, and changes thesaltparameter to be&'a str, which removes any PHC-related types as input arguments to the method.However, there is still a dependency on
ParamsStringandPasswordHash, which still needs to be addressed to fully decouple the trait from PHC types.