add test caes for the compression data types functions; refactor data

cmp_tool.c

include/cmp_data_types.h

lib/cmp_data_types.c

lib/cmp_entity.c

lib/cmp_io.c

test/cmp_data_types/meson.build

test/cmp_data_types/test_cmp_data_types.c

test/cmp_icu/test_cmp_icu.c

test/cmp_icu/test_decmp.c