The Platonic ideal of the barihunk has arrived, and his name is John Chest. The 25-year-old dreamboat is the winner of the 2010 Stella Maris International Vocal Competition, where he sang music by Rossini, Korngold, Schubert, Mendelssohn and Britten. According to a charmingly phrased press release, “Chest was put forward by the Bayerische Staatsoper, Munich,…