Add perf test for Korean phrase line break

Here is an example of minimum score (ns) on the Pixel 5
  Short Text,     Regular line break:   131,025
  Short Text,     Phrase line break :   132,650
  Long Text,      Regular line break: 1,145,408
  Long Text,      Phrase line break : 1,083,803
  Long Long Text, Regular line break: 3,957,686
  Long Long Text, Phrase line break : 3,520,376

Bug: 266152097
Test: atest

Change-Id: Id3f789a75eb11c50e144e1fbd4b8ceff24924a27