[Crashtracker]: simplify on fork #562
Description
Is there any situation where we wouldn't call both `clear_trace_ids` and `clear_span_ids`? Would it make sense to combine them together? Perhaps with `ddog_crashtracker_reset_counters`? All of them claim to need to be called after a fork, so is it weird to make API users hunt down all of these one by one?
Originally posted by @ivoanjo in #551 (comment)