See ratas@382321d2 for the
benchmark on Ratas side that tries to mimic what timeout benchmarks do.

See https://lab.nexedi.com/kirr/misc/-/blob/4f51fd6/bench/time-wheel/ratas-vs-timeout.pdf
for the result.

Not sure what I did differently on expire case, and maybe it is just Lua
vs C++, but the add and del benchmarks show that Ratas and Timeout are
of the same order in terms of performance.

I've also tried to activate LLRB-tree benchmark, and it showed that,
while expiring works faster compared to timer-wheel, adding and deleting
works siginficantly slower:

https://lab.nexedi.com/kirr/misc/-/blob/4f51fd6/bench/time-wheel/timeout-vs-llrb.pdf

For the reference original timeout vs minheap benchmark:

https://lab.nexedi.com/kirr/misc/-/blob/4f51fd6/bench/time-wheel/timeout-vs-minheap.pdf