APIv4 - Fix performance drag caused by getInfoItem calling the API

APIv4 - Fix performance drag caused by getInfoItem calling the API

This function is sometimes called thousands of times per request, e.g. for every cell
in a searchKit display table. Going through the API wrapper that many times is a
considerable (+10 sec) drag on performance.
Instead of calling Entity.get, we can just read directly from the cache where it stores its data.