[v2] Port SVG parsing fix and add SVG benchmarks

[antonfirsov]

Prerequisites

• I have written a descriptive pull-request title
• I have verified that there are no overlapping pull-requests open
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• I have provided test coverage for my change (where applicable)

Description

I decided to do run a V3 vs main comparison for #377 which required me to port benchmarks and SVG fixes, given it's done, I decided to PR this change.

FillTiger results

V3

|        Method | Dimensions |      Mean |     Error |    StdDev |    Median | Ratio | RatioSD |
|-------------- |----------- |----------:|----------:|----------:|----------:|------:|--------:|
|     SkiaSharp |        100 |  1.121 ms | 0.0570 ms | 0.1598 ms |  1.076 ms |  1.00 |    0.00 |
| SystemDrawing |        100 |  2.124 ms | 0.0459 ms | 0.1352 ms |  2.099 ms |  1.94 |    0.29 |
|    ImageSharp |        100 | 14.051 ms | 0.3276 ms | 0.9294 ms | 13.927 ms | 12.78 |    1.86 |
|               |            |           |           |           |           |       |         |
|     SkiaSharp |       1000 |  7.891 ms | 0.1565 ms | 0.2571 ms |  7.897 ms |  1.00 |    0.00 |
| SystemDrawing |       1000 | 17.623 ms | 0.3452 ms | 0.5476 ms | 17.515 ms |  2.24 |    0.10 |
|    ImageSharp |       1000 | 62.901 ms | 1.6790 ms | 4.8710 ms | 61.231 ms |  8.19 |    0.80 |

main

From #377 (comment), putting here as reference:

|                    Method | Dimensions |        Mean |     Error |      StdDev |      Median | Ratio | RatioSD |
|-------------------------- |----------- |------------:|----------:|------------:|------------:|------:|--------:|
|                 SkiaSharp |        100 |    858.7 us |   3.06 us |     9.37 us |    856.0 us |  1.00 |    0.00 |
|             SystemDrawing |        100 |  2,075.6 us |  49.87 us |   157.60 us |  2,036.1 us |  2.43 |    0.18 |
|                ImageSharp |        100 |  4,650.1 us | 115.22 us |   369.13 us |  4,729.9 us |  5.46 |    0.43 |
| ImageSharp_SingleThreaded |        100 |  7,618.4 us | 983.83 us | 3,151.81 us |  6,174.6 us |  9.29 |    3.59 |
|          ImageSharpWebGPU |        100 |  2,425.6 us | 118.34 us |   356.26 us |  2,397.2 us |  2.83 |    0.42 |
|                           |            |             |           |             |             |       |         |
|                 SkiaSharp |       1000 |  7,399.4 us | 101.66 us |   321.24 us |  7,339.4 us |  1.00 |    0.00 |
|             SystemDrawing |       1000 | 17,367.9 us | 215.58 us |   681.25 us | 17,131.4 us |  2.35 |    0.15 |
|                ImageSharp |       1000 |  6,790.0 us | 768.78 us | 2,484.95 us |  6,386.2 us |  0.92 |    0.36 |
| ImageSharp_SingleThreaded |       1000 | 15,816.6 us | 191.37 us |   610.30 us | 15,862.8 us |  2.14 |    0.13 |
|          ImageSharpWebGPU |       1000 |  4,113.7 us | 285.05 us |   900.79 us |  3,796.4 us |  0.56 |    0.13 |

DrawingThroughputBenchmark

Around 110 MP/s (2000x2000) and around 6 MP/s for small (200x200) images. So the numbers are significantly lower than the same values from the PR, regardless of parallelism applied.

[antonfirsov]

Closing because CI is drunk. I can't reproduce the build failure.