[FEATURE] Passing DrawPoints a Partial Array

[DJGosnell]

Is your feature request related to a problem?

Sometimes it's useful to pass an array of points to SKCanvas.DrawPoints but not to draw all of them. Currently there is no public method of accomplishing a partial array draw.

Describe the solution you would like

Add an override to SKCanvas.DrawPoints to allow for passing a count parameter to the SkiaApi.sk_canvas_draw_points method instead of just passing the entire array length as it currently does.

Describe alternatives you have considered

Currently the way to get around this is to create an array with the proper size ahead of time and allocate it on the heap but that requires allocation. It would be even nicer to utilize Spans for this so they can be sliced, but I see multiple PRs #2617 & #2669 are stalled so I'm not sure about their integration.

Additional context

No response

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