`InventoryItem`

// TODO // Leaving this for now since I'm not sure how inventories should actually work. // There are a few different models with significant differences. // For example, are there any persistent items which don't need to be owned by a user? i.e. the item can be removed from a user's inventory but still exists and is now possibly useable by another user? Or are all items ephemeral and obtainable in certain quantities by users? Are items purchasable? Are there 'unique' items which can only exist once? Can users trade items or given them to the specimen (req specimen inventory).. etc. // So leaving this for now until there is a better idea of what items and inventories are since the model would probably need a rework anyway