[FEATURE] Add support for radial gradient on `SKSvgCanvas`

[nandor23]

Is your feature request related to a problem?

Until now only linear gradient was supported on SKSvgCanvas, radial gradient was not implemented in Skia #3095.

This is no longer the case, as support has been added for both radial and two-point conical gradients: google/skia@f784f78

Describe the solution you would like

The gradients should work on SKSvgCanvas, just like they do on SKCanvas.
Current Skia bindings might work, but additional implementation may be needed.

Describe alternatives you have considered

None

Additional context

No response

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