build: add option for build profiling with clang -ftime-trace (#4475) #28

Job	Run time
macos-12 appleclang13/C++17 py3.11 MacOS-12	23m 53s
VFX2021 gcc9/C++17 py3.7 exr3.1 ocio2.0	10m 52s
macos-13 appleclang14/C++17 py3.11 MacOS-13	32m 58s
VFX2021 clang10/C++17 avx2 exr3.1 ocio2.0	10m 56s
macos-14 appleclang15/C++20 py3.12 MacOS-14-ARM	10m 0s
VFX2022 gcc9/C++17 py39 exr3.1 ocio2.1	11m 11s
VFX2022 clang13/C++17 py39 avx2 exr3.1 ocio2.1	11m 4s
Ubuntu latest releases gcc13 C++20 py3.12 avx2 exr3.3 ocio2.4	12m 19s
VFX2022 icc/C++17 py3.9 exr3.1 ocio2.1 qt5.15	16m 55s
Ubuntu bleeding edge gcc14 C++20 py3.12 OCIO/libtiff/exr-main avx2	22m 43s
VFX2022 icx/C++17 py3.9 exr3.1 ocio2.2 qt5.15	14m 40s
Ubuntu all local builds gcc12 C++17 avx2 exr3.2 ocio2.3	12m 2s
VFX2024 sanitizers	37m 18s
Ubuntu clang14 C++20 avx2 exr3.1 ocio2.1	12m 59s
VFX2023 gcc11/C++17 py3.10 exr3.1 ocio2.2	11m 11s
Ubuntu debug gcc9/C++17, sse4.2, exr3.1	14m 26s
VFX2024 gcc11/C++17 py3.11 exr3.2 ocio2.3	13m 13s
Ubuntu static libs gcc9 C++17 exr2.4	10m 18s
VFX2021 oldest gcc9.3/C++17 py3.7 exr-3.1	10m 55s
Ubuntu clang-format	3m 2s
VFX2021 hobbled gcc9.3/C++17 py3.7 exr-3.1 no-sse	11m 42s
VFX2023 abi check	9m 18s
windows-2019 VS2019	50m 59s
windows-2022 VS2022	48m 40s
	7h 3m 34s

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