Improve quantization

[lloeki]

What does this PR do?

Small bits of improvement to quantization and obfuscation.

Motivation

Stumbled upon a few areas that were lacking.

Additional Notes

Regex has been checked for linearity with the new Ruby 3.3 Regexp.linear_time?.

How to test the change?

env SKIP_SIMPLECOV=1 bundle exec rspec spec/datadog/tracing/contrib/utils/quantization/http_spec.rb

[codecov-commenter]

Codecov Report

Merging #3041 (c9451b7) into master (75cb379) will decrease coverage by 0.01%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #3041      +/-   ##
==========================================
- Coverage   98.12%   98.11%   -0.01%     
==========================================
  Files        1322     1322              
  Lines       74648    74648              
  Branches     3403     3403              
==========================================
- Hits        73247    73244       -3     
- Misses       1401     1404       +3     

Files Changed	Coverage Δ
...datadog/tracing/contrib/utils/quantization/http.rb	83.33% <ø> (ø)

... and 2 files with indirect coverage changes

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[ivoanjo]

Regex has been checked for linearity with the new Ruby 3.3 Regexp.linear_time?.

Maybe consider adding a test for this? We already have 3.3 in CI, and we could skip the test on all other Rubies -- we'd still benefit from no accidental changes :)

[lloeki]

Maybe consider adding a test for this? We already have 3.3 in CI

I already considered it, and am actually doing it in a separate PR to keep this one small and easy to merge.