.NET MAUI 9 SR5: Shadow enhancements (same as .NET 10)

[davidbritch]

XAML:

<VerticalStackLayout BackgroundColor="#fff" Shadow="4 4 16 #000000" />

CSS:

-maui-shadow: #000000 4 4; // color, offset X, offset Y
-maui-shadow: 4 4 16 #000000;  // offset X, offset Y, radius, color
-maui-shadow: 4 4 16 #000000 0.5;  // offset X, offset Y, radius, color, opacity

More info: dotnet/maui#27180

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Associated WorkItem - 406715