Summary:
generalize chinese digit specifier (十百千万亿) parsing, and add hanzi tests
These digits specifiers can be parsed as (<num><speci>)<num>,
by using the multiplicater value <num><speci>, and a connect function that adds them together
(two cases, skipping digits [which requires a 零 in between], and digits in consecutive locations).
Note that 个 is technically a digit specifier,
but in Chinese it is never used directly as a numeral specifier, and always as a counter.
Reviewed By: zliu41
Differential Revision: D7424249
fbshipit-source-id: 20a85a7df1f908ee9879e92b904178fa26a9a5e5
