feat(jpeg): Support encoding/decoding arbitrary metadata as comments #6774

Job	Run time
macos-13 appleclang14/C++17 py3.11 MacOS-13-Intel	22m 37s
macos-14 appleclang15/C++20 py3.12 MacOS-14-ARM	12m 0s
VFX2021 gcc9/C++17 py3.7 exr3.1 ocio2.0	13m 54s
macos-15 appleclang16/C++20 py3.13 MacOS-15-ARM	8m 58s
VFX2021 clang10/C++17 avx2 exr3.1 ocio2.0	9m 37s
VFX2022 gcc9/C++17 py39 exr3.1 ocio2.1	6m 42s
VFX2022 clang13/C++17 py39 avx2 exr3.1 ocio2.1	13m 38s
VFX2022 icc/C++17 py3.9 exr3.1 ocio2.1 qt5.15	18m 35s
Ubuntu latest releases gcc13 C++20 py3.12 avx2 exr3.3 ocio2.4	11m 17s
VFX2022 icx/C++17 py3.9 exr3.1 ocio2.2 qt5.15	16m 2s
Ubuntu bleeding edge gcc14 C++20 py3.12 OCIO/libtiff/exr-main avx2	10m 8s
VFX2024 sanitizers	34m 41s
Ubuntu all local builds gcc12 C++17 avx2 exr3.2 ocio2.3	13m 56s
VFX2023 gcc11/C++17 py3.10 exr3.1 ocio2.2	12m 9s
Ubuntu clang14 C++20 avx2 exr3.1 ocio2.1	13m 40s
VFX2024 gcc11/C++17 py3.11 exr3.2 ocio2.3	11m 36s
Ubuntu debug gcc9/C++17, sse4.2, exr3.1	13m 26s
VFX2021 oldest gcc9.3/C++17 py3.7 exr-3.1	9m 40s
Ubuntu static libs gcc9 C++17 exr2.4	14m 46s
VFX2021 hobbled gcc9.3/C++17 py3.7 exr-3.1 no-sse	10m 24s
Ubuntu clang-format	5m 26s
VFX2023 abi check	8m 53s
windows-2019 VS2019	50m 54s
windows-2022 VS2022	50m 1s
	6h 33m 0s

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