Parse row height specification in multiline environments
- Transform structure rich information on LaTeX length specifications introduced in I08996129beca9ad852d23f28d7136c982707aea1 into new TexNode class
- Adjust rows, i.e., arrays to hold length information
- Add tests
Bug: T380654
Change-Id: I1aff53c7a5782c1333ed4c16639dfc660802931c