feat(lxl-web): Suggest search filters

[olovy]

Depends on libris/definitions#560

supersearch

• List all search filters in supersearch (based on category searchfilter on property)
• Suggest filters when typing

help page

POC
Add route /help/filters for listing all available search filters.

How do we want to render them? table? cards? etc

I think we should display:

• label (all langs, current locale first)
• librisQueryCode
• comment (or more specific description for search, see TODO)
• bonus: propertyChainAxiom inside details element
  • see e.g hyllsignum / WHYL

Tickets involved

LXL-4648

Summary of changes

• Add getPropertiesByCategory to VocabUtil
• Add route /help/filters

TODO

• SuperSearchWrapper should suggest for hiddenLabel too (so that e.g. "Placering" can be found by typing "Bestånd")
• Do getPropertiesByCategory('searchFilter') only once in hooks.server.ts?
• In which cases do we need a separate description from :comment?

[johanbissemattsson]

Looks good code-wise! 👍 I'm looking forward to using this in action!

I think it makes sense to do getPropertiesByCategory('searchFilter') once in hooks.server.ts.
We could also add an cached /api/searchFilters/+server.ts route which SuperSearchWrapper can fetch the required data from.