Add `mp-units` units library #27

Job	Run time
build-without-terminfo (gcc12)	4m 10s
build-without-terminfo (clang16)	4m 51s
build (--config=clang-format)	4m 9s
build (--config=clang-tidy)	4m 51s
build (--compilation_mode=opt)	4m 28s
test (gcc12)	4m 24s
test (gcc12, asan)	4m 5s
test (gcc12, tsan)	3m 57s
test (gcc12, ubsan)	4m 14s
test (clang16)	4m 20s
test (clang16, asan)	4m 17s
test (clang16, tsan)	4m 17s
test (clang16, ubsan)	4m 25s
buildifier	13s
	56m 41s

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