ICU-22781 Adding support for constant denominators (C++) #3353

Job	Run time
clang-valgrind-test	10m 30s
clang-valgrind-intltest (utility)	6m 58s
clang-valgrind-intltest (normalize)	7m 4s
clang-valgrind-intltest (collator)	5m 37s
clang-valgrind-intltest (regex)	5m 23s
clang-valgrind-intltest (format)	16m 37s
clang-valgrind-intltest (translit)	6m 22s
clang-valgrind-intltest (rbbi)	8m 21s
clang-valgrind-intltest (rbnf)	6m 17s
clang-valgrind-intltest (rbnfrt)	6m 22s
clang-valgrind-intltest (icuserv)	5m 19s
clang-valgrind-intltest (idna)	5m 5s
clang-valgrind-intltest (convert)	7m 9s
clang-valgrind-intltest (rbnfp)	5m 14s
clang-valgrind-intltest (csdet)	5m 24s
clang-valgrind-intltest (spoof)	5m 27s
clang-valgrind-intltest (bidi)	5m 28s
	1h 58m 37s

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