Support for multiple series with multiple ordinals

[nclm]

Already mentioned in #472 #433 and inventaire/inventaire-client#413 but I couldn’t find a specific ticket about it.

When a work is part of several series, each with an ordinal:

• The work isn’t ordered on the series pages
• The ordinals don’t appear anywhere

A minimum goal could be to have those appearing properly. A more advanced version would allow editing multiple series each with their ordinal.

[nclm]

Mock-up of how editing could work:

This is trying to do with minimum changes:
– “Series ordinal” block moved up to just under “Series” block
– Series ordinal now has one field per series
– Otherwise everything stay the same

The real ideal way to implement this might be by editing the ordinal within the series block, like on Wikidata. But that means supporting subfields for qualifiers, which is a bigger UI change. I think the minimum change would already work well.

[maxlath]

I think the "proper" way to support multiple series would be to get closer to the Wikidata way, where series ordinals are represented as qualifiers, thus directly nested within the serie claim:

This is not an option with our current simplified claim data model, but we will need to complexify it anyway to support references, see #710, so also adding support for qualifiers seems doable (and would allow to scrap the data model adapter added by #565). Issue on adding qualifier support #145