Introduce Acrylic Blur Effect

[enisn]

MAUI Acrylic Blur effect implementation. Platform-specific differences might be possible. But I tried to implement as close as possible for platforms.

Done in the following PR: #303

Android implementation was very tough, thanks to https://github.com/mmin18/RealtimeBlurView

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Documentation: https://enisn-projects.io/docs/en/uranium/2.5/Blurs

Note that: Gif disrupts the quality of the effect due to compressing algorithm. You can run the demo app and see the real effect by yourself.