Step $5$: Implement the SwapCommand class and GroceryList's swap$\_$with$\_$undo$()$ method

Implement the SwapCommand class in SwapCommand.py$.$ The class itself is declared, but no attributes yet exist. Add necessary attributes and methods so that the command can undo swapping two items in the grocery list.

Implement GroceryList's swap$\_$with$\_$undo$()$ method. The method swaps list items at the specified indices, then pushes a SwapCommand, to undo that swap, onto the undo stack.

Step $6$: Implement the InsertAtCommand class and GroceryList's remove$\_$at$\_$with$\_$undo$()$ method

Implement the InsertAtCommand class in InsertAtCommand.py$.$ Add necessary fields and methods so that the command can undo removing a grocery list item at an arbitrary index.

Implement GroceryList's remove$\_$at$\_$with$\_$undo$()$ method. The method removes the list item at the specified index, then pushes an InsertAtCommand, to undo that removal, onto the undo stack.

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