feat: Add utility method to validate an IHasher hash

[Pytal]

Summary

Adds a method for validating that a hashed password has been hashed by IHasher::hash()

This can be used when the original plain text password is not known, otherwise IHasher::verify() should be used

Checklist

• Code is properly formatted
• Sign-off message is added to all commits
• [ ] Tests (unit, integration, api and/or acceptance) are included
• [x] Screenshots before/after for front-end changes
• [ ] Documentation (manuals or wiki) has been updated or is not required
• [x] Backports requested where applicable (ex: critical bugfixes)