Support Conditional Create flow to automatically opt in users to passkeys.

[nicksrandall]

More info: https://developer.apple.com/videos/play/wwdc2024/10125/

When app detects that browser supports conditional create and user has been verified using an alternative method, the app can automatically create a passkey for that user and have it stored in their password manager and linked to their account.

It would be great if this library supported the “mediation”: “conditional” option for creating a passkey.

[MasterKale]

I definitely intend to support this in SimpleWebAuthn! I've been playing around with Safari 18.0 in Dev Beta 1 to figure out what Safari's "internal conditions" means in Apple's flow chart:

Stay tuned 👀

[MasterKale]

I've created an issue to help me keep track of adding this to SimpleWebAuthn #582