Add sculk/calibrated sculk sensors to /shop

These items might be unobtainable due to the y=0 height limit (and even if they are obtainable, are very hard to find) These items could allow for some interesting/creative ideas for cannons, defenses, etc. At this point I don't see any reason to not have them in play. In general if it's a vanilla feature, I think it should be in play unless there's a reason against it.