Great Barrington, Mass.—The Metropolitan Opera’s 2022-23 “Live in HD” season will open Saturday, October 22 at 1 p.m. with Cherubini’s Medea. The Mahaiwe Performing Arts Center will broadcast the production — and subsequent operas — on its big screen with state-of-the-art audio and visual technology.   “Medea, a new production directed and designed by David McVicar, will be a great…