azure queue defer

created_message_queue_handler.ts

const failCb = (ctx: IContextWithBindings, error: string) => ctx.done(error);

export function index(context: IContextWithBindings): void {
  const fail = (ctx: IContextWithBindings, error: string, timeOut: number) =>
    setTimeout(failCb, timeOut, ctx, error);

  const timeout = Math.pow(2, context.bindingData.dequeueCount) * 1000;
  context.log("sleeping:" + timeout);
  fail(context, "error", timeout);
}