Add lounge/espresso supplies to bulk items system

[thalvors]

Lounge supplies are currently very special-cased, in that they don't have bulk items in our database and we just have to manually add them when we're putting together an order. Similarly, when we receive an order, we want the finance system to reflect the total cost of the order (so the purchaser gets reimbursed all the way) but the "add an order" form only tracks inventory, not supplies, so we have to add those manually and do adjustments. Now that we've started ordering milk, we need to bundle those into supplies overhead and manually edit the finance transaction afterwards since we don't have an espresso supplies adjustment field on the order.

We should fix this by adding all lounge and espresso supplies to the bulk_items table. We will need a "type" column that is either "Inventory", "Supplies", or "Espresso" so these get entered into the finance system in the right place (of course with room to add other types later). The inventory system should not make estimates of these items, but should have a separate section below the current estimate box that lists them all with boxes where they can write in how many we should purchase. Then these can be included in the order estimate without manually looking up the item numbers, which is what we currently do.