find_entities_filtered: Support for "area" around "position"

[Soul-Burn]

There are many times when I am looking for entities around another entity, e.g. mining area of mining drills or inserters around an assembler.
For this, I have to use various bounding box functions to produce the area from the bounding box or position of the entity.

I suggest that when "area" and "position" both exist, the area would be translated around the given position, similar to how "radius" works but for a rectangular area.