Add support for Windows using WinUIEx

[frederikprijck]

Changes

With MAUI not having built-in support for opening a browser on windows yet, we want to integrate support for Windows using WinUIEx, a community package to solve the lack of support for Windows.

See:

• [Bug] Maui Essentials WebAuthenticator not working in WinUI · Issue #2702 · dotnet/maui
• WebAuthenticationBroker API that supports all WinAppSDK OS's and application types · Issue #441 · microsoft/WindowsAppSDK

Relevant links for WinUIEx:

• https://dotmorten.github.io/WinUIEx/concepts/WebAuthenticator.html
• https://dotmorten.github.io/WinUIEx/concepts/Maui.html

Checklist

• I have read the Auth0 general contribution guidelines
• I have read the Auth0 Code of Conduct
• All existing and new tests complete without errors
• All code guidelines in the CONTRIBUTING documentation have been run/followed

[dotMorten]

Make sure you add the WebAuthenticator.CheckOAuthRedirectionActivation() to app startup in \Platforms\Windows\App.xaml.cs, as well as update the appxmanifest with your redirection scheme

[frederikprijck]

Thanks for calling that out @dotMorten , I plan to add that to the documentation (and have done so in our sample app that we will publish).

There is also the change we want to document about the WindowsAppSDK as per https://dotmorten.github.io/WinUIEx/concepts/Maui.html, but I was unable to get 1.4.230822000 to work, so had to stick to WebUIEx 2.2.0.

Thanks for providing WebUIEx, I will ensure to call out we use WebUIEx for windows support to properly credit 👍 .