Premier dance company Joffrey Ballet signed a contract in 2017 to be the resident ballet company with the most distinguished Lyric Opera of Chicago and is at last in its inaugural season.Its recent shows — “Serenade” and “Of Mice and Men” — are a real study in contrasts. Both shows run through Sunday. For the first time, Joffrey Ballet is appearing in the majestic setting of the gold-gilded opera house, accompanied by its illustrious orchestra conducted by Scott Speck.This is the first new production of George Balanchine’s …