Feature/optimize headers #3675

Job	Run time
build-cpp-test-macos (debug)	11m 48s
build-cpp-test-linux (debug, gcc)	19m 7s
build-cpp-test-macos (release)	16m 55s
build-cpp-test-windows (debug, msvc)	11m 22s
build-cpp-test-linux (debug, clang)	11m 12s
Build sdist and set version	55s
build-cpp-test-windows (debug, clang-cl)	17m 34s
build-cpp-test-linux (release, gcc)	36m 46s
build-cpp-test-windows (release, msvc)	17m 19s
build-cpp-test-linux (release, clang)	16m 56s
build-cpp-test-windows (release, clang-cl)	19m 3s
Build and test in Conda (ubuntu)	2m 40s
Build and test in Conda (windows)	6m 41s
build-and-test-python (linux-x64)	10m 10s
build-and-test-python (linux-aarch64)	34m 21s
build-and-test-python (macos)	8m 9s
build-and-test-python (windows)	12m 8s
test-python-macos-arm64	0s
publish-wheels	12s
	4h 13m 18s

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