Make copper golem carry 2 items

When searching through a copper chest, the golem should attempt to retrieve two distinct item types. If the chest contains only a single stack, it should instead take two sets of 16 items from that stack.

If the golem already holds two different items and finds a chest suitable for only one of them, it should deposit that item and then continue its search carrying the remaining one, looking for a matching chest.

The primary advantage of utilizing two inventory slots is that it effectively doubles the sorting efficiency, as the golem can carry more items and thus make better use of each trip.

Moreover, having two active slots reduces the chance of idle states (due to unmatched items). This prevents unnecessary pauses of 7 seconds, which would otherwise occur when the golem is unable to proceed with its current load.

For instance, if there are four chests, each designated for a different item type, a golem carrying two random items will have a 50% chance of successfully matching at least one of them with a chest and then he will have a 33% chance of getting next chest match if they delivered 1 yet. Instead of 25% each time.