@Nonnull
    public static <T> MergedSubscriptionBuilder<T> merge(@Nonnull Class<T> handledClass) {
        return MergedSubscriptionBuilder.newBuilder(handledClass);
    }
Makes a MergedSubscriptionBuilder for a given super type

@param handledClass the super type of the event handler
@param <T>          the super type class
@return a {@link MergedSubscriptionBuilder} to construct the event handler
helper/src/main/java/me/lucko/helper/Events.java