Expose extras namespace #4832

Job	Run time
ci (ubuntu-20.04, 18, gcc, g++, Release)	6m 32s
ci (ubuntu-20.04, 18, gcc, g++, Debug)	8m 12s
ci (ubuntu-22.04, 20, gcc, g++, Release)	6m 9s
ci (ubuntu-22.04, 20, gcc, g++, Debug)	5m 26s
ci (ubuntu-22.04, 22, gcc, g++, Release)	6m 0s
ci (ubuntu-22.04, 22, gcc, g++, Debug)	7m 37s
ci (ubuntu-24.04, 22, gcc, g++, -Db_sanitize=address, Release)	9m 0s
ci (ubuntu-24.04, 22, gcc, g++, -Db_sanitize=address, Debug)	6m 13s
ci (ubuntu-24.04, 22, clang, clang++, -Db_sanitize=undefined, Release)	10m 24s
ci (ubuntu-24.04, 22, clang, clang++, -Db_sanitize=undefined, Debug)	9m 24s
ci (ubuntu-24.04, 22, gcc, g++, -Db_sanitize=thread, Release)	7m 16s
ci (ubuntu-24.04, 22, gcc, g++, -Db_sanitize=thread, Debug)	6m 12s
ci (macos-13, 18, clang, clang++, Release)	17m 6s
ci (macos-13, 18, clang, clang++, Debug)	11m 37s
ci (macos-14, 20, clang, clang++, Release)	6m 11s
ci (macos-14, 20, clang, clang++, Debug)	4m 37s
ci (macos-15, 22, clang, clang++, Release)	6m 20s
ci (macos-15, 22, clang, clang++, Debug)	5m 54s
ci (windows-2022, 20, cl, cl, Release)	10m 12s
ci (windows-2022, 20, cl, cl, Debug)	8m 46s
ci (windows-2022, 22, cl, cl, Release)	8m 45s
ci (windows-2022, 22, cl, cl, Debug)	7m 49s
	2h 55m 42s

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