sys/xtimer: introduce xtimer_is_set()
#17630
Merged
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Contribution description
There are cases where code is using internal xtimer struct members to figure out if a given xtimer is currentlly set. So, provide a function in the public API.
I've added some uses of this function (both ways, on set timers and unset timers) to
xtimer_remove()
.I consider this addition as an intermediate step, easing migration to ztimer_xtimer_compat.
Testing procedure
CI should be fine.
Issues/PRs references