[Uno] Use SKSwapChainPanel whenever possible

[jeromelaban]

The problem

The current implementation for WinUI and Uno Platform relies on SKXamlCanvas:

Mapsui/Mapsui.UI.WinUI/MapControl.cs

Line 33 in 21a2581

private readonly SKXamlCanvas _canvas = CreateRenderTarget();

SKXamlCanvas is using software rendering (except on Uno Platform Skia Desktop targets) which get as slower as the size it is rendered to, which is particularly visible on 4K screens.

The proposed solution

Use SKSwapChainPanel on supported platforms, being iOS/Android targets (catalyst does not support OpenGL) and WebAssembly. On Skia targets, SKSwapChainPanel automatically uses hardware acceleration.

On Windows, AngleSwapChainPanel will be available for WinAppSDK in SkiaSharp 3.0.

Here's an usage example for both canvases.

[inforithmics]

Intresting, I think it can be implemented like in MAUI with UseGPU property. Where the default is depending on the running platform.

[inforithmics]

pull request: #2629