@Nullable
    @Contract(value = "null -> null; !null -> !null", pure = true)
    public static TtlTimerTask get(@Nullable TimerTask timerTask) {
        return get(timerTask, false, false);
    }
Factory method, wrap input {@link TimerTask} to {@link TtlTimerTask}.
<p>
This method is idempotent.

@param timerTask input {@link TimerTask}
@return Wrapped {@link TimerTask}
ttl2-compatible/src/main/java/com/alibaba/ttl/TtlTimerTask.java