[FEATURE] Add support for creating DirectX and Metal GR contexts.

[RaphProductions]

Is your feature request related to a problem?

I'd like to have DirectX to be used in my SkiaSharp-based library on Windows, for creating a custom window backdrop, but it seems like there's no GRContext.CreateDX... And using OpenGL and DX at the same time is... absurd.

Describe the solution you would like

I'd like to have DirectX GRContext support... Like you create a Direct3D 11 device, the create a SS cavcass with it...

Describe alternatives you have considered

None...

Additional context

No response

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