[Feature Request] PassKeys API

Nobody has claimed this yet.

### Describe the bug

> Passkeys are the future of authentication, and for good reason! They're incredibly easy to use and intuitive, eliminating the need for complicated password creation processes and the hassle of remembering them. Plus, they're unique to each website or application, so you don't have to worry about someone using your passkey to access other services. And unlike passwords, passkeys are resistant to phishing attempts, making them a much more secure option. Best of all, you can use your passkey across all your devices, so you never have to worry about forgetting your password again!

Unfortunately, there is no information on how to use it with c#/winui (I couldn't find it).
So it is very exciting to have API for it.

https://support.microsoft.com/en-us/windows/passkeys-in-windows-301c8944-5ea2-452b-9886-97e4d2ef4422

### Packaging type

Packaged (MSIX), Unpackaged

### Windows version

Windows 11 version 22H2 (22621, 2022 Update)

### IDE

Visual Studio 2022

Start by reviewing the linked Windows passkeys documentation and the existing Windows App SDK C#/WinUI API surface. The issue does not name files, entry points, tests, or acceptance criteria, so the scope and definition of done would need to be established before implementation.

Written by the indexing model from the issue text.