Window Backdrop Support : Mica and Acrylic

[singhashish-wpf]

• Win 11 theme in WPF should also support acrylic background, Mica styles for eg: Transparent glass like background
• App layering and card layout are some more detailed features of the mica material theme which should be supported to bring the same look and feel to WPF apps.
• Measure the performance impact of the changes for Mica and Acrylic