Increase max clump size for items.

With the new change of items inside bundles and skulker boxes being dropped when the skulker or bundle is destroyed it can be easier than ever to cause massive amounts of lag using items. Increasing the number of items that can clump together on the ground could help mitigate this.

If the max number of items that can clump was changed from 64 (I dont know if that's the actual current max) to 256 (for example) it would reduce the number of entities by 4x which could significantly improve performance in some situations.