Add flag for KitchenTap letting the user know if event is consumption(drinking)

[sophieoneill]

When a KitchenTap event occurs, if the type of event is consumption i.e. water for drinking, this results in zero discharge as we assume the tap users consumes all the water. A useful addition would be to add a flag to the consumption object that would let the user know if the event is consumption or not, in order to explain a difference in consumption vs discharge water.