Better trace ids

[bvdmitri]

This PR changes the generation of trace ids (also renamed to span ids) in order to remove massive performance hit for certain models. In my benchmark, the generation of trace IDs affected benchmarks by a factor of 7! And this was even without enabling the callbacks. The current PR changes the implementation a bit by calling an auxiliary function ReactiveMP.generate_span_id that would simply return nothing if callbacks are also nothing. That fixes the performance hit in case when callbacks are not set, but otherwise it still uses uuid4 (definitely the culprit). We may want to use a simple global Int counter for that? Not sure if it would be faster though since this counter would need to be guarded with semaphores to protect from two threads generating the same span ID.

@fonsp wdyt?

[bvdmitri]

The affected benchmark is this one just in case

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
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Additional details and impacted files

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  Coverage             ?   80.76%           
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  Files                ?      212           
  Lines                ?     6466           
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  Hits                 ?     5222           
  Misses               ?     1244           
  Partials             ?        0           

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[fonsp]

Beautiful!

[bvdmitri]

@fonsp could you adjust trace_id -> span_id in RxInfer accordingly? I just noticed we do there as well, basically just need to change the fields and use the ReactiveMP.generate_span_id there too

[bvdmitri]

ReactiveBayes/RxInfer.jl#634