Add chinese/rime-data and its dependencies

A new metaport that provides an essential set of configuration ports and a
preset of IME schema ports for the Rime IME framework.

This is a metaport which depends on the following essential ports:

chinese/rime-essay
chinese/rime-prelude

This also depends on the following ports to form a preset of IME
schemas available:

chinese/rime-stroke
chinese/rime-cangjie
chinese/rime-bopomofo
chinese/rime-luna-pinyin
chinese/rime-terra-pinyin

Besides the above essential + preset IME schema ports, chinese/rime-cantonese
is also added as a IME schema port for Cantonese users.

Submitted by: Ka Ho Ng <khng300@gmail.com>
Sponsored by: The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D27652