Uv bio enrollment, continued

[kaczmarczyck]

Rebases and continues #718 .

The second commits adds the following missing features:

• PIN authentication of BioEnrollment subcommands that require it.
• A compile flag for all new features.
• Cleanup and generalization of the fingerprint API. (Example: setloglevel can be part of the TockEnv implementation, but shouldn't be included in the API.)
• A more useful fake implementation of the fingerprint API.
• Customization of Veridian's hardcoded numbers.
• Rollback of customizations that are specific to Veridian.
• Whether or not state is held is now left to the implementer of the fingerprint API. BioEnrollment is explicitly not a stateful command according to the specification.
• Don't ignore errors from hardware interaction, but forward them.
• Correct handling of UV retries: Reset everywhere necesary, and don't decrease the retry counter when asking for UV, but only when the user actually presented their finger.
• Removed magic numbers.
• Style matches existing code.
• CBOR parsing is more readable with new structs.
• Unit tests.
• Fixed all comments from the former PR.

Still missing:

• A more complete fake for testing.
• Tests for all subcommands.
• A working TockEnv implementation.

As is, the implementation is not usable on hardware.

Moves a lot of the code from the first commit around, so looking at these commits in isolation is harder than reviewing their sum.

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[kaczmarczyck]

/gemini review