add reschedule

[querdenker2k]

change timer runnable to consumer(JRuleTimer) to reschedule timers, like this

    createTimer(ZonedDateTime.now().plusSeconds(5), t -> {
            if (something) {
                t.reschedule(ZonedDateTime.now().plusSeconds(5));
            }
    }

[querdenker2k]

i am not really sure if this is the best approach, but i didn't see another one.