Function binop 

pub fn binop<T, F>(initial: T, reducer: F) -> BinaryOperatorAggregate<T, F>
where
    T: Serialize + for<'de> Deserialize<'de> + Clone + Send + Sync + Debug + 'static,
    F: Fn(T, T) -> T + Send + Sync + 'static,

Helper to create a BinaryOperatorAggregate channel