Task: Port and Enhance WorkingWithWebview Sample from Xamarin.Forms to .NET MAUI

[jsuarezruiz]

Migrate the WorkingWithWebview sample from Xamarin.Forms to a new .NET MAUI project, updating namespaces, XAML syntax, and control usage accordingly.
https://github.com/xamarin/xamarin-forms-samples/tree/main/WorkingWithWebview