Investigate the use of some level of snapshot testing

[bijington]

Something along the lines should work but we need to find a way to wrap it up nicely for use:

[Test]
public void SceneShouldRenderAsExpected()
{
    var scenery = new Scenery();
    var canvas = new SkiaCanvas();
    var bitmap = new SKBitmap(new SKImageInfo(1000, 1000));
    canvas.Canvas = new SKCanvas(bitmap);

    // Test our Render implementation
    scenery.Render(canvas, new Microsoft.Maui.Graphics.RectF(0, 0, 1000, 1000));

    using var stream = File.Create("snapshot.png");
    bitmap.Encode(stream, SKEncodedImageFormat.Png, 100);
}

public class Scenery : GameScene
{
    public override void Render(Canvas canvas, RectF dimensions)
    {
        base.Render(canvas, dimensions);

        canvas.FillColor = Colors.PaleGoldenrod;
        canvas.FillRectangle(new Rect(0, 0, 100, 100));
    }
}

This currently just involves a GameScene implementation that simply draws a rectangle on screen.