fix(internal): revert rust rate limiter [backport 2.10]

[brettlangdon]

Rust, just revert back to the original pure python rate limiter.

The impact here is fairly low, the Rust rate limiter is much faster, but this code isn't the slow part of a hot path, better to be safe than fast.

Fixes #10002

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• The PR description includes an overview of the change

• The PR description articulates the motivation for the change

• The change includes tests OR the PR description describes a testing strategy

• The PR description notes risks associated with the change, if any

• Newly-added code is easy to change

• The change follows the library release note guidelines

• The change includes or references documentation updates if necessary

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• Reviewer has checked that all the criteria below are met

• Title is accurate

• All changes are related to the pull request's stated goal

• Avoids breaking API changes

• Testing strategy adequately addresses listed risks

• Newly-added code is easy to change

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• If necessary, author has acknowledged and discussed the performance implications of this PR as reported in the benchmarks PR comment

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[datadog-dd-trace-py-rkomorn]

Datadog Report

Branch report: backport-10225-to-2.10
Commit report: 13f8719
Test service: dd-trace-py

✅ 0 Failed, 143690 Passed, 32780 Skipped, 9h 58m 28.8s Total duration (1h 42m 29.52s time saved)
⌛ 5 Performance Regressions

⌛ Performance Regressions vs Default Branch (5)

• test_commit - test_kafka.py 1m 30.01s (+1m 26.61s, +2550%) - Details
• test_no_propagation_via_env_var - test_tornado_web.py 3.76s (+3.05s, +427%)
• test_schematized_operation_names[v0] - test_djangorestframework.py 6.82s (+5.54s, +433%)
• test_schematized_operation_name[v1] - test_request.py 6.79s (+5.88s, +646%) - Details
• test_schematized_service_name[None-mysvc] - test_request.py 5.78s (+4.87s, +533%) - Details

[pr-commenter]

Benchmarks

Benchmark execution time: 2024-08-14 19:52:23

Comparing candidate commit 13f8719 in PR branch backport-10225-to-2.10 with baseline commit 5b2d1f8 in branch 2.10.

Found 1 performance improvements and 5 performance regressions! Performance is the same for 215 metrics, 9 unstable metrics.

scenario:otelspan-start

• 🟩 max_rss_usage [-8.103MB; -8.063MB] or [-21.048%; -20.946%]

scenario:ratelimiter-defaults

• 🟥 execution_time [+1.647µs; +1.680µs] or [+60.371%; +61.616%]

scenario:ratelimiter-high_rate_limit

• 🟥 execution_time [+1.901µs; +1.942µs] or [+69.576%; +71.086%]

scenario:ratelimiter-long_window

• 🟥 execution_time [+1.634µs; +1.669µs] or [+59.679%; +60.954%]

scenario:ratelimiter-low_rate_limit

• 🟥 execution_time [+1.495µs; +1.528µs] or [+54.414%; +55.613%]

scenario:ratelimiter-short_window

• 🟥 execution_time [+1.647µs; +1.679µs] or [+60.470%; +61.672%]

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 74.13793% with 15 lines in your changes missing coverage. Please review.

Project coverage is 10.21%. Comparing base (4d99cf0) to head (13f8719).
Report is 5 commits behind head on 2.10.

Files	Patch %	Lines
ddtrace/internal/rate_limiter.py	74.13%	15 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             2.10   #10229       +/-   ##
===========================================
- Coverage   74.24%   10.21%   -64.04%     
===========================================
  Files        1332     1313       -19     
  Lines      126730   125126     -1604     
===========================================
- Hits        94096    12777    -81319     
- Misses      32634   112349    +79715     

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