Add SKMatrix.MapPoints/MapVectors, SKPath.AddPoly overloads with Span<SKPoint>

[alexandrvslv]

Description of Change

When you nead maps several points without heap allocation and with only one pInvoke

cost of pInvoke

p1 = matrix.MapPoint(p1);
p2 = matrix.MapPoint(p2);
p3 = matrix.MapPoint(p3);

cost of allocation

var points = new [] { p1,  p2,  p3 };
matrix.MapPoints(points, points);

decision

Span<SKPoint> points = stackalloc [] { p1,  p2,  p3 };
matrix.MapPoints(points, points);

Miss SKPath.AddPoly tests

API Changes

Added:

• void SKMatrix.MapPoints(Span<SKPoint> result, ReadOnlySpan<SKPoint> points)
• void SKMatrix.MapVectors(Span<SKPoint> result, ReadOnlySpan<SKPoint> points)
• void SKPath.AddPoly (ReadOnlySpan<SKPoint> points, bool close = true)

Behavioral Changes

None.

Required skia PR

None.

PR Checklist

• Has tests (if omitted, state reason in description)
• Rebased on top of main at time of PR
• Merged related skia PRs
• Changes adhere to coding standard
• Updated documentation

[dotnet-policy-service]

Hey there @alexandrvslv! Thank you so much for your PR! Someone from the team will get assigned to your PR shortly and we'll get it reviewed.

[alexandrvslv]

@dotnet-policy-service agree