Passkey support for authentication

[Piedone]

Is your feature request related to a problem?

Username/password authentication has issues that passkeys solve.

Describe the solution you'd like

We could have passkeys as an additional authentication method now that ASP.NET Core has built-in support for it.

Describe alternatives you've considered

Alternate authentication options (all the SSO and social login options) are useful too, and would remain, of course.

[hishamco]

@rwxzig, do you want to take this PR?

[rwxzig]

@hishamco no way 😅, but I am looking forward to seeing this feature.

[hishamco]

I can help you with this @rwxzig

[github-actions]

We triaged this issue and set the milestone according to the priority we think is appropriate (see the docs on how we triage and prioritize issues).

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