Security Keys: Update with webauthn methods

[Ecarrion]

Part of https://github.com/woocommerce/woocommerce-ios/issues/10851 Part of https://github.com/woocommerce/woocommerce-ios/issues/10852

Why

This PR integrates the new webauthn endpoints added on WordPessKit to the LoginFacade.

The changes on this PR will be used on subsequent PRs but are split for easier review.

How

• Update signInToWordpressDotCom function to call the correct needsultiFactor delegate when a webauthn is detected.
• Consume .requestWebauthnChallenge method. Return challenge info if successful or fire error delegate if failure.
• Consume authenticateWebauthnSignature method. Fire success delegates with OAuth token if successful. Or error delegates if failure.

Demo

https://github.com/wordpress-mobile/WordPressKit-iOS/assets/562080/2f69ea2f-b680-4d0a-8840-3a76540f935d

Testing

You can believe the video 😅 or you can test this experimental branch

Notes

• Compiling the experimental branch may be a bit buggy, Cocoapods doesn't work that well with unreleased versions of a pod.
• You need to have a WordPress.com account with a non-A8C email to test social logins
• Magic links do not work. pe5pgL-3QM-p2

Steps

• Launch the woo app from the experimental branch
• Continue with user name/password OR continue with Google or Apple with a non-A8C email.
• See that the two-factor screen presents a "Use a security key" CTA
• Select that option and select your passkey stored in the iOS keychain.
• See that you are correctly authenticated.