[Draft] Add credProtect extension to Fido2.Models

[dbeinder]

https://developer.mozilla.org/en-US/docs/Web/API/Web_Authentication_API/WebAuthn_extensions#credprotect
https://fidoalliance.org/specs/fido-v2.2-rd-20230321/fido-client-to-authenticator-protocol-v2.2-rd-20230321.html#sctn-credProtect-extension

The input part should be okay, but does the extension output need parsing from JSON? Or should it be extracted from the authenticator data CBOR?

[codecov-commenter]

Codecov Report

Attention: 7 lines in your changes are missing coverage. Please review.

Comparison is base (15263ca) 77.50% compared to head (50f3a7e) 77.41%.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #448      +/-   ##
==========================================
- Coverage   77.50%   77.41%   -0.10%     
==========================================
  Files          98       98              
  Lines        2716     2727      +11     
  Branches      445      448       +3     
==========================================
+ Hits         2105     2111       +6     
- Misses        492      496       +4     
- Partials      119      120       +1     

Files	Coverage Δ
...s/Objects/AuthenticationExtensionsClientOutputs.cs	77.77% <0.00%> (-9.73%)	⬇️
...ls/Objects/AuthenticationExtensionsClientInputs.cs	10.00% <0.00%> (-2.50%)	⬇️
Src/Fido2.Models/Converters/FidoEnumConverter.cs	71.42% <66.66%> (+4.76%)	⬆️

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[jonashendrickx]

Confirmed input to be working.

[aseigler]

LGTM!