[OpenTelemetry] Create span in spanner CDC to start new trace when otel is enabled.

[stankiewicz]

Create span in spanner CDC to start new trace when otel is enabled.

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[gemini-code-assist]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 57.07%. Comparing base (4fd1744) to head (d68a5c6).
⚠️ Report is 45 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff              @@
##             master   #39567      +/-   ##
============================================
- Coverage     58.12%   57.07%   -1.05%     
+ Complexity    13086     3641    -9445     
============================================
  Files          2521     1190    -1331     
  Lines        264308   191389   -72919     
  Branches      10786     3815    -6971     
============================================
- Hits         153616   109242   -44374     
+ Misses       104922    78632   -26290     
+ Partials       5770     3515    -2255     

Flag	Coverage Δ
java	72.16% <100.00%> (+7.92%)	⬆️

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Assigning reviewers:

R: @kennknowles for label java.
R: @nielm for label spanner.

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[bvolpato]

LGTM.