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Add RoundedRectanglePolygon and PathBuilder helpers. #891

Job	Run time
WarmLFS	13s
Build (windows-latest, net10.0, 10.0.x, true, -x64, false)	2m 4s
Build (macos-26, net8.0, 8.0.x, -x64, true)	2m 0s
Build (ubuntu-latest, net8.0, 8.0.x, -x64, false)	1m 31s
Build (windows-latest, net8.0, 8.0.x, -x64, false)	2m 25s
Build (ubuntu-latest, net10.0, 10.0.x, true, -x64, false)	1m 36s
Build (macos-26, net10.0, 10.0.x, true, -x64, false)	1m 49s
Build (ubuntu-22.04-arm, net8.0, 8.0.x, -x64, false)	1m 58s
Build (ubuntu-22.04-arm, net10.0, 10.0.x, true, -x64, false)	1m 40s
Publish	0s
	15m 16s

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