refactor opendrive property

The opendrive specification defines different properties, and comments in the code which ones are **required**, which ones are **optional**, and which ones are **sub-properties**

[SPEC 1.8.0](https://publications.pages.asam.net/standards/ASAM_OpenDRIVE/ASAM_OpenDRIVE_Specification/latest/specification/08_coordinate_systems/08_01_introduction.html)