Add toggles for what contents to search

[iross]

With the addition of context enrichment, the API now has parameters to search different content fields (e.g. object+captions, object+captions+text context). It would be nice to have these toggles available in the "Advanced search options" style dropdown we have.

Obviously there's changes on the visualizer side, but I'd also need to add something on the API so the interface can see what options are available.

[github-actions]

This issue is stale because it has been open for 60 days with no activity.