WebAuthn/Passkeys support

[RihanArfan]

Feature request

Is your feature request related to a problem? Please describe.

No, it's purely a nice feature I would like to see.

I would like WebAuthn to be supported in Supabase Auth. Auth0 will be adding support for WebAuthn which you can see through their flows preview here (sidebar -> WebAuthn).

Describe the solution you'd like

Adding support for registering and logging in using WebAuthn, or allowing it to be used as two-factor authentication.

Describe alternatives you've considered

It is possible to implement it myself for my own projects though I'm sure others may like this feature in the SDK/part of auth, and it'd set Supabase ahead in modern compared to Firebase.

Additional context