feat: biometric authentication for mobile devices

[kkopanidis]

This feature will allow mobile apps to use built-in Fingerprint/FaceID sensors and allow users to use passwordless biometric login. It implements Fido2 in part, but not fully. To be fully implemented, we need to do a fair bit of research of the spec.

Future expansions of this feature include:

• Passwordless registration
• FIDO2 implementation
• Use as part of MFA solution

What kind of change does this PR introduce?

• Bugfix
• Feature
• Code style update
• Refactor
• Build-related changes
• Other (please describe)

Does this PR introduce a breaking change?

• Yes
• No

The PR fulfills these requirements:

• It's submitted to the main branch
• When resolving a specific issue, it's referenced in the PR's description (e.g. fix #xxx, where "xxx" is the issue number)

If adding a new feature, the PR's description includes:

• A convincing reason for adding this feature

Other information:

[ghost]

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