Add CITATION.cff for repository citation metadata (#738) #4582

Job	Run time
pre-commit / check-file-sizes	6s
pre-commit / pre-commit	1m 54s
ubuntu / clang-build (ubuntu-24.04)	2m 42s
mac / clang-build (Release)	1m 53s
mac / clang-build (Debug)	2m 42s
windows / msvc-build (Debug)	4m 52s
windows / msvc-build (Release)	3m 38s
windows / clang-build	2m 23s
ubuntu / gcc-build (ubuntu-24.04, Debug)	2m 11s
ubuntu / gcc-build (ubuntu-24.04, Release)	2m 31s
mac / clang-test	4m 54s
windows / clang-test	3m 0s
ubuntu / clang-test (ubuntu-24.04)	8m 21s
ubuntu / clang-sanitizer-build (ubuntu-24.04)	3m 27s
ubuntu / gcc-test (ubuntu-24.04)	8m 24s
windows / msvc-test	5m 45s
windows / clang-test-extended	2m 49s
ubuntu / clang-sanitizer-test (ubuntu-24.04)	2m 57s
mac / clang-test-extended	2m 46s
ubuntu / clang-sanitizer-test-extended (ubuntu-24.04)	2m 23s
windows / msvc-test-extended	4m 11s
ubuntu / clang-test-extended (ubuntu-24.04)	4m 31s
ubuntu / gcc-test-extended (ubuntu-24.04)	4m 45s
ubuntu / gcc-build-codecov	7m 29s
perf / macos-clang-build-perf-stats	1m 42s
perf / ubuntu-gcc-build-perf-stats	1m 31s
pages / build-scoreboard	19s
pages / build-doxygen-xml	46s
pages / build-sphinx	1m 1s
pages / deploy-pages	21s
	1h 36m 14s

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