Snapshot: mechanism for internal Tokio tracing subscriber to OTLP byes or console output

[jmacd]

For demonstration.
This is the main mechanism of #1771

[jmacd]

For discussion with @utpilla about what #1808 is supposed to help with.

[codecov]

Codecov Report

❌ Patch coverage is 51.25786% with 155 lines in your changes missing coverage. Please review.
✅ Project coverage is 84.32%. Comparing base (8e6891b) to head (1fe4533).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1813      +/-   ##
==========================================
- Coverage   84.37%   84.32%   -0.05%     
==========================================
  Files         496      498       +2     
  Lines      144547   145593    +1046     
==========================================
+ Hits       121955   122772     +817     
- Misses      22058    22287     +229     
  Partials      534      534              

Components	Coverage Δ
otap-dataflow	85.56% <51.25%> (-0.09%)	⬇️
query_abstraction	80.61% <ø> (ø)
query_engine	90.52% <ø> (ø)
syslog_cef_receivers	∅ <ø> (∅)
otel-arrow-go	53.50% <ø> (ø)
quiver	90.66% <ø> (+0.85%)	⬆️

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