svtjpegxs: add SVT JPEG XS encoder/decoder
Based on: https://github.com/OpenVisualCloud/SVT-JPEG-XS/
Lots of improvements possible, but KISS for now.
Edited by Tim-Philipp Müller
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Based on: https://github.com/OpenVisualCloud/SVT-JPEG-XS/
Lots of improvements possible, but KISS for now.