## Description
**Reasons:**
- Our current use of `Special:EntityData` only supports one entity returned per call; for some use cases it will be desirable to fetch multiple entities at once.
- `wbgetentities` will support the optimization parameters envisioned by T382921.
- In fetching items, the `props` parameter of `wbgetentities` can be used for optimization purposes.
The relevant code is in db.js.
See T368654 for some discussion of the characteristics of these two APIs.
**Desired behavior/Acceptance criteria (returned value, expected error, performance expectations, etc.)**
* The response time from Wikidata should be no greater then it is currently (except marginally to allow for returning multiple items).
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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