Add the raw product returned from the Storefront API to also return from useProduct

[blittle]

At the moment useProduct() does not return the actual product from the Storefront API. Instead it only returns variants and product options. So if the developer wants any of the root product properties, they instead have to manually drill those props, or setup their own provider. This change makes the entire raw product from the Storefront API available:

function SomeComponent() {
  const {product} = useProduct();

  return (
    <div>
      <h2>{product.title}</h2>
      <h3>{product.description}</h3>
    </div>
  );
}

Resolves #689

[blittle]

I'm assuming that this won't be a problem, changing the memo dependency array. I'd think if the product changes, so would these arrays. Also if these arrays change, so would the wrapping product.

[frehner]

Looks good to me so far. Would love to close #632 as part of this as well if we can! ❤️

[frehner]

🚢