WO-1582 Add tracing getInvocationSpan

[jmorrell-cloudflare]

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[ask-bonk]

LGTM!

github run

[codecov-commenter]

Codecov Report

❌ Patch coverage is 30.23256% with 60 lines in your changes missing coverage. Please review.
✅ Project coverage is 67.66%. Comparing base (562fea1) to head (99aa5ed).

Files with missing lines	Patch %	Lines
src/workerd/api/tracing.c++	0.00%	44 Missing ⚠️
src/workerd/io/io-context.c++	58.97%	10 Missing and 6 partials ⚠️

Additional details and impacted files

@@                       Coverage Diff                        @@
##           jmorrell/add-get-active-span    #7112      +/-   ##
================================================================
- Coverage                         67.68%   67.66%   -0.03%     
================================================================
  Files                               459      459              
  Lines                            129561   129647      +86     
  Branches                          21165    21184      +19     
================================================================
+ Hits                              87695    87720      +25     
- Misses                            29036    29089      +53     
- Partials                          12830    12838       +8     

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