[WIP] perf: read-write-locked scope data

[jpnurmi]

Make sentry-native multi-threading friendly by allowing concurrent scope data readers. This removes the global scope mutex bottleneck from concurrent logs and metrics enrichment without changing public scope behavior.

Before

tests/benchmark.py::test_benchmark_logs[1] PASSED
Min 0.002ms, Max 0.002ms, Mean 0.002ms, Median 0.002ms, CPU 0.002ms                                                                                                                                                                                                                                      [ 25%]
tests/benchmark.py::test_benchmark_logs[8] PASSED
Min 0.026ms, Max 0.026ms, Mean 0.026ms, Median 0.026ms, CPU 0.008ms                                                                                                                                                                                                                                      [ 50%]
tests/benchmark.py::test_benchmark_logs[16] PASSED
Min 0.067ms, Max 0.067ms, Mean 0.067ms, Median 0.067ms, CPU 0.010ms                                                                                                                                                                                                                                      [ 75%]
tests/benchmark.py::test_benchmark_logs[32] PASSED
Min 0.121ms, Max 0.121ms, Mean 0.121ms, Median 0.121ms, CPU 0.010ms

After

tests/benchmark.py::test_benchmark_logs[1] PASSED
Min 0.004ms, Max 0.004ms, Mean 0.004ms, Median 0.004ms, CPU 0.004ms                                                                                                                                                                                                                                      [ 25%]
tests/benchmark.py::test_benchmark_logs[8] PASSED
Min 0.011ms, Max 0.011ms, Mean 0.011ms, Median 0.011ms, CPU 0.011ms                                                                                                                                                                                                                                      [ 50%]
tests/benchmark.py::test_benchmark_logs[16] PASSED
Min 0.024ms, Max 0.024ms, Mean 0.024ms, Median 0.024ms, CPU 0.022ms                                                                                                                                                                                                                                      [ 75%]
tests/benchmark.py::test_benchmark_logs[32] PASSED
Min 0.048ms, Max 0.048ms, Mean 0.048ms, Median 0.048ms, CPU 0.030ms

Close: #1862

[cursor]

Cursor Bugbot has reviewed your changes and found 2 potential issues.

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[codecov]

Codecov Report

❌ Patch coverage is 87.26899% with 124 lines in your changes missing coverage. Please review.
✅ Project coverage is 75.16%. Comparing base (1039e31) to head (a725ba4).

Additional details and impacted files

@@                    Coverage Diff                     @@
##           jpnurmi/ref/scope-data    #2042      +/-   ##
==========================================================
+ Coverage                   74.70%   75.16%   +0.45%     
==========================================================
  Files                         103      103              
  Lines                       27227    27629     +402     
  Branches                     4924     5041     +117     
==========================================================
+ Hits                        20341    20767     +426     
+ Misses                       5542     5520      -22     
+ Partials                     1344     1342       -2     

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