public static <K, V> Grouped<K, V> valueSerde(final Serde<V> valueSerde) {
        return new Grouped<>(null, null, valueSerde);
    }
Create a {@link Grouped} instance with the provided valueSerde.  If {@code null} the default value serde from config will be used.

@param valueSerde
       the {@link Serde} used for serializing the value. If {@code null} the default value serde from config will be used

@param <K> the key type
@param <V> the value type

@return a new {@link Grouped} configured with the valueSerde

@see KStream#groupByKey(Grouped)
@see KStream#groupBy(KeyValueMapper, Grouped)
@see KTable#groupBy(KeyValueMapper, Grouped)
streams/src/main/java/org/apache/kafka/streams/kstream/Grouped.java