implement the nice methods of Guava ListenableFuture

[oldratlee]

🎯 Determined 🆙

• implement the catching() of Guava ListenableFuture #196
  • Suggestion from the author @linzee1 of article 深入理解 Future, CompletableFuture, ListenableFuture，回调机制. 💕
• implement successfulAsList method of Guava ListenableFuture #197
  • this method is similar to cffu#mostSuccessOf() without timeout parameters, simpler and nice.

🕗 TBD

• getChecked()​ / getUnchecked()​
  • getting result with unwrapped exception is useful.
  • there are join() methods in cffu, need getUnchecked methods?
• inCompletionOrder()​
  • COOL, but seems rarely used in business.