One import static to rule them all

[Remi Forax]

I wonder if we should not create one artificial interface that extends 
Collector, FlatMapper, etc,
i.e. every interfaces that declare static methods that can be used by 
the Stream API
just because it will be easier to do an import static on this interface.

interface StaticDefaults   // better name needed
   extends Collector<Void, Void>, FlatMapper<Void,Void> {
}

otherwise, every Java projects will define its own one.

cheers,
Rémi