Implement PublicKeyCredentialHint for WebAuthn L3

[jonashendrickx]

Implements WebAuthn L3 PublicKeyCredentialHints:

• https://www.w3.org/TR/webauthn-3/#enum-hints
• https://www.w3.org/TR/webauthn-3/#dictdef-publickeycredentialcreationoptions
• https://www.w3.org/TR/webauthn-3/#dictdef-publickeycredentialrequestoptions

When the Hints property is set on CredentialCreateOptions, AuthenticatorSelection.AuthenticatorAttachment will be set to CrossPlatform to match the spec for backwards compatibility. By default the Hints property will be null.

Depends on PR #525 to make the build and tests pass.

[codecov-commenter]

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Codecov Report

Attention: Patch coverage is 14.28571% with 12 lines in your changes missing coverage. Please review.

Project coverage is 74.04%. Comparing base (b1157a5) to head (f08a91d).

Files	Patch %	Lines
Src/Fido2.Models/CredentialCreateOptions.cs	7.69%	12 Missing ⚠️

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Additional details and impacted files

@@            Coverage Diff             @@
##           master     #524      +/-   ##
==========================================
- Coverage   74.36%   74.04%   -0.32%     
==========================================
  Files         100      100              
  Lines        2641     2655      +14     
  Branches      443      446       +3     
==========================================
+ Hits         1964     1966       +2     
- Misses        576      588      +12     
  Partials      101      101              

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[abergs]

Thanks! Looks mostly good, see comment on AuthenticatorAttachment.

Also - this PR is missing the implementation on assertion - hints are supported there too, not only on create.

[abergs]

Thanks for the fix, this makes sense!