ICU-22435 Add C API for Locale #411

Job	Run time
clang-valgrind-test	13m 14s
clang-valgrind-intltest (utility)	8m 36s
clang-valgrind-intltest (normalize)	11m 3s
clang-valgrind-intltest (collator)	6m 2s
clang-valgrind-intltest (regex)	7m 17s
clang-valgrind-intltest (format)	24m 13s
clang-valgrind-intltest (translit)	8m 8s
clang-valgrind-intltest (rbbi)	9m 16s
clang-valgrind-intltest (rbnf)	9m 24s
clang-valgrind-intltest (rbnfrt)	7m 46s
clang-valgrind-intltest (icuserv)	8m 55s
clang-valgrind-intltest (idna)	7m 52s
clang-valgrind-intltest (convert)	8m 22s
clang-valgrind-intltest (rbnfp)	8m 30s
clang-valgrind-intltest (csdet)	6m 51s
clang-valgrind-intltest (spoof)	8m 26s
clang-valgrind-intltest (bidi)	8m 35s
	2h 42m 30s

Provide feedback