ICU-22781 Adding support for constant denominators (C++) #3341

Job	Run time
clang-valgrind-test	10m 18s
clang-valgrind-intltest (utility)	6m 55s
clang-valgrind-intltest (normalize)	6m 15s
clang-valgrind-intltest (collator)	3m 21s
clang-valgrind-intltest (regex)	5m 42s
clang-valgrind-intltest (format)	16m 39s
clang-valgrind-intltest (translit)	6m 11s
clang-valgrind-intltest (rbbi)	8m 9s
clang-valgrind-intltest (rbnf)	6m 24s
clang-valgrind-intltest (rbnfrt)	6m 18s
clang-valgrind-intltest (icuserv)	5m 21s
clang-valgrind-intltest (idna)	5m 27s
clang-valgrind-intltest (convert)	7m 1s
clang-valgrind-intltest (rbnfp)	5m 13s
clang-valgrind-intltest (csdet)	5m 16s
clang-valgrind-intltest (spoof)	5m 34s
clang-valgrind-intltest (bidi)	5m 57s
	1h 56m 1s

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