Allow the Grindstone to transfer enchantments to a book

I suggest adding a new function to the Grindstone while keeping its normal functionality. When an item is placed in the Grindstone by itself, it should work exactly as it does now. However, when an enchanted item is placed in the top slot and a normal book is placed in the bottom slot, the Grindstone should create an enchanted book containing all the enchantments that the item had, including their original levels. When the player takes the result, the normal book is consumed, the player receives the enchanted book, and the original item is returned without its enchantments. For example, if a gold pickaxe has Fortune III, Efficiency IV, Unbreaking III, and Mending, placing the pickaxe and a normal book in the Grindstone would give the player the same gold pickaxe without enchantments and one enchanted book containing Fortune III, Efficiency IV, Unbreaking III, and Mending. This would add a useful new function without changing the Grindstone's existing behavior.