Lisa Cohen’s lush biography, All We Know (Farrar Straus and Giroux), is a staggering labor of love that offers a triptych of three women of a queer persuasion. Cohen sets this story in the early 20^th century, giving her audience a catalogue of the largely forgotten life during that time. Her subjects–the great intellectual Esther Murphy, the celebrity connoisseur Mercedes de Acosta, and the fashion maverick Madge Garland…