Theater review LITTLE BEAR RIDGE ROAD 95 minutes, with no intermission. At the Booth Theatre, 222 W. 45th St. Actress Laurie Metcalf and playwright Samuel D. Hunter are a match made in Middle America.  There are few writers who can sublimely craft, and without any condescension, powerful stories set in flyover country as well as Hunter, whose searing “The Whale” was made into an Oscar-winning movie starring Brendan Fraser . And Metcalf, although a rockstar of the New York stage, still explodes