Expose extras namespace #4833

Job	Run time
ci (ubuntu-20.04, 18, gcc, g++, Release)	6m 34s
ci (ubuntu-20.04, 18, gcc, g++, Debug)	6m 13s
ci (ubuntu-22.04, 20, gcc, g++, Release)	5m 39s
ci (ubuntu-22.04, 20, gcc, g++, Debug)	5m 26s
ci (ubuntu-22.04, 22, gcc, g++, Release)	5m 48s
ci (ubuntu-22.04, 22, gcc, g++, Debug)	5m 11s
ci (ubuntu-24.04, 22, gcc, g++, -Db_sanitize=address, Release)	8m 42s
ci (ubuntu-24.04, 22, gcc, g++, -Db_sanitize=address, Debug)	6m 22s
ci (ubuntu-24.04, 22, clang, clang++, -Db_sanitize=undefined, Release)	10m 7s
ci (ubuntu-24.04, 22, clang, clang++, -Db_sanitize=undefined, Debug)	7m 21s
ci (ubuntu-24.04, 22, gcc, g++, -Db_sanitize=thread, Release)	7m 4s
ci (ubuntu-24.04, 22, gcc, g++, -Db_sanitize=thread, Debug)	6m 17s
ci (macos-13, 18, clang, clang++, Release)	10m 28s
ci (macos-13, 18, clang, clang++, Debug)	6m 53s
ci (macos-14, 20, clang, clang++, Release)	3m 56s
ci (macos-14, 20, clang, clang++, Debug)	6m 19s
ci (macos-15, 22, clang, clang++, Release)	3m 58s
ci (macos-15, 22, clang, clang++, Debug)	4m 14s
ci (windows-2022, 20, cl, cl, Release)	9m 20s
ci (windows-2022, 20, cl, cl, Debug)	8m 22s
ci (windows-2022, 22, cl, cl, Release)	9m 7s
ci (windows-2022, 22, cl, cl, Debug)	8m 8s
	2h 31m 29s

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