Massive inefficiency + multiple evaluation in bounding box syntaxes

[sovdeeth]

Describe the bug

        return boundingBoxExpression.stream(event).flatMap(boundingBox -> entityDataExpression.stream(event).flatMap(entityData -> {
            Class<? extends Entity> entityClass = entityData.getType();
            Predicate<Entity> filter = entity -> entityClass.isAssignableFrom(entity.getClass());
            return worldExpression.stream(event).flatMap(world -> world.getNearbyEntities(boundingBox, filter).stream());
        })).toArray(Entity[]::new);

can evaluate entitydata and world expression many multiple times, and could call getNearbyEntities many more times than necessary (it's also rather messy code but that's subjective). (ExprBoundingBoxEntities)
I believe this applies to some other bounding box syntaxes too.

To Reproduce
eval EBBE with multiple bounding boxes or entity datas, see that world expression is evaled many times

Expected behavior
only evaluate expressions once

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