Passkey support

[ranok]

Passkeys are slowly replacing passwords as a more smooth and secure option. It would be great to let users enroll, then use passkeys on their devices to authenticate to Bookwyrm.

[RokeJulianLockhart]

#3015 (comment)

Wouldn't creating a https://github.com/bookwyrm-social/bookwyrm/issues/new?assignees=&labels=&projects=&template=feature_request.md&title= for this make more sense, @ranok? https://github.com/bookwyrm-social/bookwyrm/issues?q=is%3Aissue+is%3Aopen+sort%3Aupdated-desc+passkey returns 0 results.