Add example of how to create a new trace in same process

[tidal]

This PR adds a an example of how to create a new trace in the same process by resetting the scope/context.

[codecov]

Codecov Report

Merging #650 (f57df81) into main (39c99e5) will decrease coverage by 0.00%.
The diff coverage is n/a.

@@             Coverage Diff              @@
##               main     #650      +/-   ##
============================================
- Coverage     84.46%   84.45%   -0.01%     
- Complexity     1140     1141       +1     
============================================
  Files           126      127       +1     
  Lines          2761     2766       +5     
============================================
+ Hits           2332     2336       +4     
- Misses          429      430       +1     

Flag	Coverage Δ
7.4	84.40% <ø> (-0.01%)	⬇️
8.0	84.45% <ø> (-0.01%)	⬇️
8.1	84.45% <ø> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/Contrib/OtlpGrpc/Exporter.php	90.00% <0.00%> (-1.53%)	⬇️
src/Contrib/Jaeger/SpanConverter.php	96.47% <0.00%> (-0.24%)	⬇️
src/Contrib/Jaeger/IdConverter.php	100.00% <0.00%> (ø)

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update 39c99e5...f57df81. Read the comment docs.

[tidal]

Hmm, this is again showing some drop in code coverage for totally unrelated classes.
Maybe using the complete CI matrix as a key for the code coverage report will fix this?