Enable advanced unlock binding with a key file or hardware key

[J-Jamet]

Is your feature request related to a problem? Please describe.
It is currently not possible to link a fingerprint to a key file.

Describe the solution you'd like
Allow the advanced unlock (i.e. a fingerprint) to be linked to a key file to allow the registration of 3 distinct factors :

• Something You Know : Password
• Something You Are : KeyFile with Fingerprint
• Something You Have : HardwareKey (linked to Support yubikey challenge response #8 Add support for hmac-secret FIDO2 extension #304)

Additional context
It will still be possible to link advanced unlock to a password for those who want to unlock their database faster.
However, you will have to pay attention to the UX so that users are not lost.
Visual indicators will help to identify which element is linked to the advanced unlock for each database.

[johannesrave]

I would love to see this implemented. I use the same database and keyfile on Windows (with KeepassXC) with Windows Hello (so a fingerprint). I'd like to also be able to set both on Android.