ICU-22942 MF2 ICU4C: NFC-normalize names and keys according to spec #3062

Job	Run time
clang-valgrind-test	10m 8s
clang-valgrind-intltest (utility)	6m 54s
clang-valgrind-intltest (normalize)	7m 2s
clang-valgrind-intltest (collator)	5m 10s
clang-valgrind-intltest (regex)	5m 32s
clang-valgrind-intltest (format)	16m 2s
clang-valgrind-intltest (translit)	6m 14s
clang-valgrind-intltest (rbbi)	8m 1s
clang-valgrind-intltest (rbnf)	6m 23s
clang-valgrind-intltest (rbnfrt)	6m 26s
clang-valgrind-intltest (icuserv)	5m 39s
clang-valgrind-intltest (idna)	5m 16s
clang-valgrind-intltest (convert)	6m 56s
clang-valgrind-intltest (rbnfp)	5m 23s
clang-valgrind-intltest (csdet)	5m 26s
clang-valgrind-intltest (spoof)	5m 18s
clang-valgrind-intltest (bidi)	5m 38s
	1h 57m 28s

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