BlazorWebView for WinUI 3

### Description

Please enable BlazorWebView for WinUI 3. I currently have Blazor Views that I would like to use in a native WinUI 3 app and there is no easy way to do that.

What I find strange is that I understand BlazorWebView works in Winforms + WPF and not in WinUI3.

### Public API Changes

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### Intended Use-Case

Here is an example view of how I want to use it , this is part of the WinUI 3 Control galley app.


This is a code snippet in MAUI of the functionality:


I think it will also make native WinUI development more approachable and powerful where I can now sherry pick the best UI assets that exist in the market. ( from web , native controls or skia ) and my feeling is native development needs this as it is becoming more and more difficult to justify native WinUI3 development over PWA apps.

It will also significantly decrease the cost of native windows development.

I also raised this request in WinUI 3 template studio but I understand the feature should be raised in the maui repo here.

https://github.com/microsoft/TemplateStudio/issues/4506

Start by comparing the existing BlazorWebView support in WinForms, WPF, and MAUI with the WinUI 3 Control Gallery example referenced in the issue. The Template Studio issue may provide additional context. Done means Blazor views can be hosted in a native WinUI 3 app with documented, working support.

Written by the indexing model from the issue text.