Description

The dereferenceZObjects and retrieveWikidataEntity functions should converge into a single fetching function. This way, improvements to one (like caching and pre-caching) will automatically be extended to both wikilambda_fetch and wikidata calls.

Desired behavior/Acceptance criteria (returned value, expected error, performance expectations, etc.)

• create separate cache and pre-cache for Wikidata items
• collapse dereferenceZObjects and retrieveWikidataEntity logic into a single underlying function to share fetching, caching, and pre-caching logic

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Completion checklist

• Before closing this task, review one by one the checklist available here: https://www.mediawiki.org/wiki/Abstract_Wikipedia_team/Definition_of_Done#Back-end_Task/Bug_completion_checklist