perf: read-write-locked scope data

[jpnurmi]

Protect scope data with read-write locks, allowing concurrent scope data readers for logs and metrics enrichment.

To be merged together with #2091 that removes the global scope mutex, which is the final step to actually allow parallel reads of the newly RW-locked scope data.

Ref: #1862

#skip-changelog (#2091)

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Codecov Report

❌ Patch coverage is 94.10977% with 44 lines in your changes missing coverage. Please review.
✅ Project coverage is 75.00%. Comparing base (8183ab7) to head (233ea8b).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2042      +/-   ##
==========================================
+ Coverage   74.74%   75.00%   +0.25%     
==========================================
  Files         103      103              
  Lines       27449    27784     +335     
  Branches     4966     5055      +89     
==========================================
+ Hits        20518    20838     +320     
- Misses       5585     5587       +2     
- Partials     1346     1359      +13     

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Cursor Bugbot has reviewed your changes and found 1 potential issue.

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