Judged in confidence, writers including Jim Crace, Aminatta Forna and Pankaj Mishra only learn of their lucrative honours as they are awardedThe announcement of the second annual Windham Campbell literature prizes has brought shock and joy to eight authors around the world, with writers of fiction, essays and drama suddenly finding themselves $150,000 (£90,000) richer.Selected by a prize jury from nominations asse…