ICU-21812 move Age/Block/Script to a separate trie #1955

Job	Run time
clang-valgrind-test	2m 39s
clang-valgrind-intltest (utility)	3m 5s
clang-valgrind-intltest (normalize)	2m 52s
clang-valgrind-intltest (collator)	2m 57s
clang-valgrind-intltest (regex)	2m 52s
clang-valgrind-intltest (format)	3m 4s
clang-valgrind-intltest (translit)	2m 52s
clang-valgrind-intltest (rbbi)	2m 50s
clang-valgrind-intltest (rbnf)	2m 44s
clang-valgrind-intltest (rbnfrt)	2m 54s
clang-valgrind-intltest (icuserv)	2m 42s
clang-valgrind-intltest (idna)	2m 35s
clang-valgrind-intltest (convert)	2m 44s
clang-valgrind-intltest (rbnfp)	2m 35s
clang-valgrind-intltest (csdet)	2m 55s
clang-valgrind-intltest (spoof)	2m 59s
clang-valgrind-intltest (bidi)	2m 41s
	48m 0s

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