Apple and iOS WebAuthn PRF support

[christopherwxyz]

Creating a draft issue to begin the conversation for support.

Starting with iOS 18 there is support, no support backwards, and no support for Android devices yet. Currently largeBlob is only supported.

https://developer.apple.com/documentation/authenticationservices/

https://developer.apple.com/documentation/authenticationservices/asauthorizationpublickeycredentialprfassertioninput-swift.struct

[peterferguson]

Hey sorry only seeing this now,

Yes I plan on adding this to iOS asap, it should be relatively simple to add in iOS and afaik PRF should already be supported on the Android and Web.

Will report back here and close out when I get time to add it 👍

[sparten11740]

If you're open to contributions, I gave this a shot in #51

[peterferguson]

Added in #51, #52

Available starting at v0.4.0