By Matthew Lesh Instead of criticising Tesco for having a bumper year, we should praise it for providing cheap food and jobs for millions, says Matthew Lesh There’s an unorthodox tourist sight that I always tick off on trips abroad. It’s not that I don’t check out the historic squares, the museums and galleries or even the nightlife. It’s just that I am obsessed with doing the most usual chores: going to the supermarket. A quick visit can teach you much about a place and its people. From the whole squid in a Greek supermarket to the immaculate patisserie section in a French one, there’s always…