Add BGRA to PixelMapping.cs #622

Job	Run time
MacOS (Q8/Q16/Q16-HDRI)	5m 3s
Linux (Q8/Q16/Q16-HDRI, x64)	6m 46s
Linux (Q8/Q16/Q16-HDRI, arm64)	1h 13m 50s
Library (Core)	7m 26s
Linux musl (Q8/Q16/Q16-HDRI, x64)	6m 31s
Library (SystemDrawing)	7m 26s
Library (SystemWindowsMedia)	7m 48s
Windows (Q8, x86)	9m 12s
Windows (Q8, x64)	11m 35s
Windows (Q8, arm64)	8m 20s
Windows (Q8, Any CPU)	10m 49s
Windows (Q8-OpenMP, x64)	10m 6s
Windows (Q8-OpenMP, arm64)	8m 4s
Windows (Q16, x86)	11m 14s
Windows (Q16, x64)	9m 55s
Windows (Q16, arm64)	8m 50s
Windows (Q16, Any CPU)	11m 7s
Windows (Q16-OpenMP, x64)	10m 29s
Windows (Q16-OpenMP, arm64)	9m 9s
Windows (Q16-HDRI, x86)	13m 17s
Windows (Q16-HDRI, x64)	9m 59s
Windows (Q16-HDRI, arm64)	7m 9s
Windows (Q16-HDRI, Any CPU)	9m 47s
Windows (Q16-HDRI-OpenMP, x64)	9m 23s
Windows (Q16-HDRI-OpenMP, arm64)	6m 53s
	4h 50m 8s

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