Add .gitattributes #4549

Job	Run time
pre-commit / check-file-sizes	4s
pre-commit / pre-commit	2m 2s
windows / clang-build	2m 18s
ubuntu / clang-build (ubuntu-24.04)	3m 9s
mac / clang-build (Release)	3m 36s
windows / msvc-build (Debug)	3m 38s
mac / clang-build (Debug)	2m 54s
windows / msvc-build (Release)	2m 4s
ubuntu / gcc-build (ubuntu-24.04, Debug)	2m 7s
ubuntu / gcc-build (ubuntu-24.04, Release)	2m 18s
windows / clang-test	2m 50s
ubuntu / gcc-test (ubuntu-24.04)	8m 23s
ubuntu / clang-test (ubuntu-24.04)	8m 20s
ubuntu / clang-sanitizer-build (ubuntu-24.04)	3m 45s
mac / clang-test	4m 29s
windows / msvc-test	4m 43s
windows / clang-test-extended	2m 55s
ubuntu / clang-sanitizer-test (ubuntu-24.04)	2m 50s
mac / clang-test-extended	2m 48s
windows / msvc-test-extended	2m 57s
ubuntu / clang-sanitizer-test-extended (ubuntu-24.04)	2m 24s
ubuntu / gcc-test-extended (ubuntu-24.04)	4m 28s
ubuntu / clang-test-extended (ubuntu-24.04)	4m 32s
ubuntu / gcc-build-codecov	7m 26s
perf / ubuntu-gcc-build-perf-stats	1m 24s
perf / macos-clang-build-perf-stats	2m 9s
pages / build-scoreboard	14s
pages / build-doxygen-xml	18s
pages / build-sphinx	44s
pages / deploy-pages	-1s
	1h 31m 48s

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