[Navigation] Add Window Navigator similar to existing (Content-)DialogNavigator

[DevTKSS]

What would you like to be added:

I would like to be able to have the INavigator open a Window with optional provide-able own Window SubClass similar to our current ContentDialogNavigator

Why is this needed:

• Flexibility of UI Controls use-able for Navigation
• E.g. could get then also implemented to really enable a WebView to be used like wrong-stated in: [WebView] [Auth] Wrong Docs title suggesting to be able to use Web Auth provider with WebView #2972

For which Platform:

• iOS
• Android
• WebAssembly
• WebAssembly renders for Xamarin.Forms
• Windows
• Desktop
• Build tasks

Anything else we need to know?

The WebView2 inside of a own Window is by the way used in the 0Auth Repo for their Oidc client interactive Web Auth flow for WPF target 👍

• maybe worth a look? https://github.com/auth0/auth0-oidc-client-net/blob/master/src/Auth0.OidcClient.WPF/WebViewBrowser.cs
• https://github.com/auth0/auth0-oidc-client-net/blob/master/src/Auth0.OidcClient.WPF/WebBrowserBrowser.cs

Currently trying to replicate this from different sources, but without Oidc Dependency or Uno.Extensions.Authentication.Oidc because this is again internally using WebAuthenticationBroker (not available on Desktop) and I would like to finally have a working interactive Authentication usable on a non-Mobile target (Mission Impossible...)

[kazo0]

I'm wondering if we can achieve this with perhaps a new Qualifier? Something like +? So navigation to a route such as +MyRoute would launch a new Window and navigate directly to the MyRoutePage

[DevTKSS]

@kazo0 Sounds awesome!
Maybe you could check if this feature could come side by side of this window Hostbuilder Extension:

• Provide a Window factory to host builder #2916

Looks like its PR just missing a review 🤔

Could become kind of a "windowing features" release 😎