Returns the storage for the given slot that has been attached to the ME Grid. Interacting with this inventory
(rather than getOriginalCellInventory(int)) will update the visual state of the cell in this inventory.
The storage returned from this method may or may not be the same object as
getOriginalCellInventory(int).
Returns the inventory of the storage cell in the given slot or null.
NOTE: Interacting with this inventory directly will bypass any monitoring done by chests or drives and thus may
not properly update things like LED colours.