Add sample for LineHeightStyle.Mode.PerLine

TAG=agy
CONV=6a150c76-4f35-43bb-8f3d-bb17402fa8e9

Bug: 520107988
Test: ./gradlew :compose:ui:ui-text:samples:compileDebugKotlin
Relnote: "N/A"
Change-Id: Id93d29ecb07e535911ba2312738101e15934ce71