Display lists of element's entity on parent entities layouts

[jum-s]

Today lists with an entity URI appears on the entity layout in question. It would improve discoverability to also have lists on the following parent entities layouts too:

• author whose work/edition belong to a list
• subjects/genres whose work/edition belong to a list

see entities-map

Since requesting the whole tree might be database intensive for many-children entities (all elements of all editions of all work of an author, for Victor Hugo...) could be interesting to test limiting this listings queries to parent entities with a small amount of children.

This would prioritize smaller entities visibility, before putting everything in cache later.

[jum-s]

Related issue https://github.com/inventaire/inventaire/issues/717 as works comments shall not be displayed on author page for the moment to avoid confusion (but it may change later if interest raise).