By David Flaherty, New York City Correspondent Starting this Sunday, and running for one week, countless gallons of hard apple cider will fill glasses throughout New York City and the Hudson Valley like never before. And after years of toiling away in relative obscurity, artisan producers from the Finger Lakes and throughout the Hudson Valley will expose there wares to a mostly naive public.  It's about time. We in the Northeastern United States have some of the best climactic and geographic conditions in the world for producing cider apples (learn more about the making of hard apple cider).  Two years…