I think there is no helper method for sort bytes list now, if we need to pass the comparator, we need to pass that everywhere we need to sort the bytes list. The methods in `CollectionUtils` are all for specific type of lists in hppc like `FloatArrayList`, `LongArrayList`. I think it's fine to add a new method there just for sort bytes list, so it can be used in other place as well. @jpountz what do you think?