code: public <U> FutureStream<U> generateAsync(final Supplier<U> s) {
          return this.constructFutures(ReactiveSeq.generate(() -> 1)
                                                  .map(n -> CompletableFuture.supplyAsync(s, getExecutor())));
  
      }
docs: Generate an infinite FutureStream executing the provided Supplier continually and asynhcronously
  
  <pre>
  {@code
  new LazyReact().generate(this::load)
  .limit(5)
  .reduce(SemigroupK.stringConcat);
  
  Optional["data1data2data3data4data5"]
  
  }</pre>
  @param s Supplier to execute asynchronously to create an infinite Stream
  @return Infinite FutureStream