Adds a command that allows you to add the item you're holding to the compostable items list, any new item added has a 30% composting chance, the only way for those items to be composted is to use a hopper.
Commands are as follows:
add held item to the compostable list: /function compost:add
remove held item from the compostable list: /function compost:remove
see the custom compostable list: /function compost:add

