Add the line break word style(lw) in the style run.

The line break word style(lw) is a phrase-based braking.
Support the line break word style in the style run and pass it to ICU for calculation.

Bug: 183780874
Test: atest minikin_tests
Change-Id: I37247617649ced5671c0edd5ba15db1fbb511b4d
15 files changed