Add unicode_data.combining() for combining class.
Add unicode_data.combining() for combining class.

The interface is the same as Python's own unicodedata.

wskplho/noto-monolithic,wskplho/noto-monolithic,yannisl/noto-monolithic,wskplho/noto-monolithic,yannisl/noto-monolithic,yannisl/noto-monolithic,wskplho/noto-monolithic,yannisl/noto-monolithic