Generate vacancy sections (Freimeldeabschnitte) for yaramo topologies

This generator works on the assumption that one edge can be part of zero or one vacancy sections. It will create one vacancy section for each edge and also add them to the topology as a whole as well as the relevant routes.

$ poetry add git+https://github.com/simulate-digital-rail/yaramo
$ poetry install

VacancySectionGenerator(topology).generate()
print(topology.vacancy_sections)