Daniel D'Addario Chief TV CriticIn 2019, British television writer and producer Russell T Davies turned his attention to the future with the gripping limited series “Years and Years.” Now, he’s transporting us to a past that seems both distant and all too recent.“It’s a Sin,” which launches this month on HBO Max after a run on Britain’s Channel 4, follows a group of friends living in London through the 1980s — a decade that begins, for them, with the promise of liberation and moves, as the AIDS