Add some API for Allays to set/modify attributes

getter:

• Current Owner (UUID, Nullable) of the Allay
• Current Search Item (ItemStack, Nullable)
• canPickupLoot (boolean)
• current status of the Allay (Listening to Noteblock, Dancing, searching for items, returning items)

setter:

• New Owner of the Allay
• modify pickup Timeout

Events:

• Maybe some events to detect the next targeted Item
• Event when Allay tries to pickup an item (cancellable)