Conti Manfredo di San Bonifacio   It’s not every day that Milford-area diners get to dine with a count. But on Friday, March 18, Conti Manfredo di San Bonifacio will be showcasing his wines at Benvenuto, a Milford restaurant.  The count and the restaurant are a perfect pairing, said Diego Lascano, the restaurant’s wine and beverage director.  “We are a …