Use specific Wikidata properties for TV series

[marfox]

The generation of Wikidata statements about works by people can be more fine grained for IMDb. Currently, we only take into account the generic class audiovisual_work.

• [ ] distinguish between movies and TV series;
• [ ] find relevant Wikidata PIDs for TV series with date values, like start and end of series;
• [ ] generate specific statements for movies;
• [ ] generate specific statements for TV series.