feat: use facet request to reduce content fetched when facets in use

[rs-amp]

Currently, all requests to archive or export content items fetch all content at a given folder, repo or even hub. The fetched content is then reduced in software, though this is obviously after we already have everything.

This PR accelerates certain types of facet requests, so that their content is not fetched at all.

(description being written).

This acceleration does not activate all the time - there are a few caveats:

• For the content item export command, requesting content by facet means that individual requests have to be made to request the content body, so a decision is made to request all content vs the faceted content + individual matches depending on the number of faceted matches returned by the server.
• Complex regex is not supported. Only exact match /^like this$|^with multiple$/ and simple partial match /(like this \(with escaped special characters\))|(multiple) on most fields. Details to be filled out later.
  • schema, locale can only be accelerated when searching with exact match.