Yiyun Li has garnered legions of fans with her unsparing prose, writing extensively about her own struggles with depression and suicidality. Her latest novel, “The Book of Goose,” is no different, sharing the same quality that has made Ms. Li something of a beacon to those suffering beneath unbearable emotional weight. Alexandra Kleeman, also a novelist, meets Ms. Li to discover the secrets of her charm, her experience of growing up in China and her writing process.