Add passkey support into the MapIdentityApi endpoints

[mikekistler]

Is there an existing issue for this?

• I have searched the existing issues

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

This is needed for users that want to support Passkeys in API applications.

Describe the solution you'd like

Expose APIs for Registration and Attestation of Passkeys in the MapIdentityApi endpoints.

Additional context

No response

[mguinness]

Referencing #53343 as the work to scaffold identity endpoints in MapIdentityApi is somewhat related.