Paginated lit.Reference API

[rabstejnek]

Create new REST API for paginated API for lit.Reference mirror the current TagsJSON API. The following
routes are possible:

• /lit/api/assessment/:assessment_id:/references/?tag_id=:tag_id:
• /lit/api/assessment/:assessment_id:/references/?tag_id=:tag_id:&search_id=:search_id:
• /lit/api/assessment/:assessment_id:/references/?tag_id=untagged

The following frontend changes were made:

• paginate references on lit tagtree modal reference browsing
• create Paginator React component

To test, view any literature Tagtree and click a node w/ > 50 references. It should return much quicker than before and the list will have pagination at the bottom:

Additional unrelated changes:

• found fixed a few cases where instance.assessment.id was used instead of instance.assessment_id to prevent extra queries
• wrap html on long lit.Search import strings
• filter openapi warnings on unit tests
• remove @action(methods=("get",)) since that is the default

In the future, additional changes will be made to migrate to these APIs.

[shapiromatron]

@rabstejnek looked good, but i went ahead and implemented using it on the frontend so it doesn't become stale; please take a look at my changes and let me know what you think...

[rabstejnek]

@shapiromatron I checked it out on the front end, it looks good!