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add new tool `entomb` #5995

Job	Run time
docs / Build linux64	1m 35s
lint / lint	58s
test / Windows MSVC / Build win64	11m 28s
test / Linux gcc-12 / Build linux64	3m 50s
test / Linux gcc-10 / Build linux64	2m 41s
test / Run Linux test suite / Test (ubuntu, gcc-10, default plugins, default config)	1m 4s
test / Run Linux test suite (gcc-12, all plugins) / Test (ubuntu, gcc-12, all plugins, default config)	52s
test / Run Windows test suite / Test (windows, msvc, default plugins, default config)	1m 1s
test / Run Windows test suite (empty config) / Test (windows, msvc, default plugins, empty config)	1m 14s
	24m 43s

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