Add support for path gradient shader in SKShader Class

[RamarajMarimuthu]

Is your feature request related to a problem?

We aim to achieve a path gradient effect using the SkiaSharp library. However, there isn't a shader effect available that replicates the path gradient functionality found in the System.Drawing library.

We are expecting a SKShader.CreatePathGradient() method in SKShader Class.

Please refer the below System.Drawing reference links,
https://learn.microsoft.com/en-us/dotnet/desktop/winforms/advanced/how-to-create-a-path-gradient?view=netframeworkdesktop-4.8
https://learn.microsoft.com/en-us/dotnet/api/system.drawing.drawing2d.pathgradientbrush?view=windowsdesktop-9.0

Note: We are focusing on cross-platform rendering, which means we cannot utilize System.Drawing APIs.

Describe the solution you would like

We are expecting a SKShader.CreatePathGradient() method in SKShader Class, which works more similar to PathGradientBrush.

Describe alternatives you have considered

Currently, we are using Radial Gradient Shader as an alternative for Path Gradient Shader.

Additional context

Our requirement is to draw the path gradient effect in image file as similar to Microsoft Word.

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