[New Feature]performance of new QRCode(qrCodeData).GetGraphic() when pixelsPerModule expend

[serfend]

Type of issue

[ ] Bug
[ ] Question (e.g. about handling/usage)
[*] Request for new feature/improvement

Expected Behavior

when use new QRCode(qrCodeData).GetGraphic() to generate a code , it would be too slow to joying users when a large pixelsPerModule is set.
it'd be better to use qrcode render to get o(1) rather than use for(for())g.FillRectangle() on o(n²).