public static <V1, V2> LeftOrRightValue<V1, V2> makeLeftValue(final V1 leftValue) {
        return new LeftOrRightValue<>(leftValue, null);
    }
Create a new {@link LeftOrRightValue} instance with the V1 value as {@code leftValue} and
V2 value as null.

@param leftValue the left V1 value
@param <V1>      the type of the value
@return a new {@link LeftOrRightValue} instance
streams/src/main/java/org/apache/kafka/streams/state/internals/LeftOrRightValue.java