item tracker: add beans

[briaguya-ai]

• total # of beans (always 10)
• # of beans bought (or found with bean pack)
• # of beans planted
• # of beans in inventory

[garrettjoecox]

I think we can say the keys part of this issue complete. Technically we aren't displaying amount of keys used, but you can deduce the answer to that question from the other 3 values.

For beans we have the data already, just need to add them to tracker, probably in a way similar to keys