Watch out, restaurants: Sam's Club is speeding up its delivery options and including more fresh and prepared foods.Dominick Reuter/Business InsiderGrocery chains have been leaning into ready-to-eat foods in recent years.The move aims to meet demand from time-stretched shoppers who don't want to pay restaurant prices.The compromise is more expensive than groceries, but cheaper than eating out.Time is money.At least that's sometimes the thinking w…