ICU-22942 MF2 ICU4C: NFC-normalize names and keys according to spec #159

Job	Run time
clang-valgrind-intltest (utility)	7m 11s
clang-valgrind-test	10m 9s
clang-valgrind-intltest (normalize)	6m 37s
clang-valgrind-intltest (collator)	5m 9s
clang-valgrind-intltest (regex)	5m 30s
clang-valgrind-intltest (format)	16m 16s
clang-valgrind-intltest (translit)	6m 1s
clang-valgrind-intltest (rbbi)	7m 42s
clang-valgrind-intltest (rbnf)	6m 26s
clang-valgrind-intltest (rbnfrt)	6m 19s
clang-valgrind-intltest (icuserv)	5m 22s
clang-valgrind-intltest (idna)	5m 20s
clang-valgrind-intltest (convert)	6m 45s
clang-valgrind-intltest (rbnfp)	5m 18s
clang-valgrind-intltest (csdet)	5m 23s
clang-valgrind-intltest (spoof)	5m 29s
clang-valgrind-intltest (bidi)	5m 9s
	1h 56m 6s

Provide feedback