feat(prof): add 'tracing' features #3094
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Description
This adds the
tracing
andtracing-subscriber
features to the profiler. Enablingtracing-subscriber
requirestracing
. These are not meant to be enabled for customer builds at this time. The goal is to use this data to enable benchmarking and other useful tools during development. Currently it's configured by theRUST_LOG
env var (when built with the feature, of course).We may want to move some of our logging of the PHP lifecycle to use this in the future.
Reviewer checklist