SPOTTING HOPEFUL dining trends isn’t easy these days, but if you look closely, it’s possible to divine a few green shoots of promise rising here and there around the city’s increasingly chilly, COVID-challenged restaurant landscape. Anyone who has perused the bountiful holiday delivery treats available around town knows that the takeout business continues to blossom. As an avid consumer of grains, sauces, and coffee beans, I have also enjoyed the new “pantry” option that has been sprouting up lately on local restaurants’ websites. Inventive Asian cooking at small, nimble establishments like Connie Chung’s excellent Chinese café, Milu, in the Flatiron District, seems to be on the upswing, too, and like at Milu, which Chung opened after a long stint at Eleven Madison Park, many of these accomplished chefs happen to…