feat(IBA): IBA::scale() (#4541) #9053

Job	Run time
VFX2021 gcc9/C++17 py3.7 exr3.1 ocio2.0	16m 26s
VFX2023 gcc11/C++17 py3.10 exr3.1 ocio2.2	13m 59s
VFX2024 gcc11/C++17 py3.11 exr3.2 ocio2.3	14m 25s
VFX2024 sanitizers	37m 55s
VFX2021 clang10/C++17 avx2 exr3.1 ocio2.0	16m 7s
VFX2023 abi check	14m 3s
VFX2022 gcc9/C++17 py39 exr3.1 ocio2.1	15m 16s
VFX2022 clang13/C++17 py39 avx2 exr3.1 ocio2.1	15m 5s
VFX2022 icc/C++17 py3.9 exr3.1 ocio2.1 qt5.15	19m 10s
Ubuntu latest releases gcc13 C++20 py3.12 avx2 exr3.3 ocio2.4	18m 41s
VFX2022 icx/C++17 py3.9 exr3.1 ocio2.2 qt5.15	14m 32s
windows-2019 VS2019	50m 55s
VFX2021 oldest gcc9.3/C++17 py3.7 exr-3.1	15m 38s
Ubuntu bleeding edge gcc14 C++20 py3.12 OCIO/libtiff/exr-main avx2	11m 28s
VFX2021 hobbled gcc9.3/C++17 py3.7 exr-3.1 no-sse	16m 8s
Ubuntu all local builds gcc12 C++17 avx2 exr3.2 ocio2.3	20m 7s
windows-2022 VS2022	39m 25s
Ubuntu clang14 C++20 avx2 exr3.1 ocio2.1	10m 15s
Ubuntu debug gcc9/C++17, sse4.2, exr3.1	15m 10s
Ubuntu static libs gcc9 C++17 exr2.4	13m 44s
macos-13 appleclang14/C++17 py3.11 MacOS-13-Intel	18m 17s
macos-14 appleclang15/C++20 py3.12 MacOS-14-ARM	8m 59s
Ubuntu clang-format	3m 13s
macos-15 appleclang16/C++20 py3.13 MacOS-15-ARM	17m 45s
	7h 16m 43s

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