[APPSEC-57239] Extract derivative schema compression into a module

[Strech]

What does this PR do?

Extract tag compression logic for WAF derivative schemas into a separate module

Motivation:

We want to compress that way only schemas and compression worth to be extracted

Change log entry

Yes. AppSec: Add temporary handling for UTF-8 unsafe payloads in InApp-WAF to prevent runtime exceptions.

Additional Notes:

It was hard to come up with a good name, did my best

How to test the change?

CI is enough

[datadog-datadog-prod-us1]

Datadog Report

Branch report: appsec-57239-fix-derivatives-compression
Commit report: c6077a6
Test service: dd-trace-rb

✅ 0 Failed, 20832 Passed, 1370 Skipped, 3m 43.88s Total Time

[pr-commenter]

Benchmarks

Benchmark execution time: 2025-04-14 14:19:19

Comparing candidate commit c6077a6 in PR branch appsec-57239-fix-derivatives-compression with baseline commit f6543eb in branch master.

Found 0 performance improvements and 0 performance regressions! Performance is the same for 31 metrics, 2 unstable metrics.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 97.14286% with 2 lines in your changes missing coverage. Please review.

Project coverage is 97.76%. Comparing base (f6543eb) to head (c6077a6).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
lib/datadog/appsec/event.rb	81.81%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #4573      +/-   ##
==========================================
+ Coverage   97.73%   97.76%   +0.02%     
==========================================
  Files        1405     1407       +2     
  Lines       86185    86216      +31     
  Branches     4358     4357       -1     
==========================================
+ Hits        84237    84290      +53     
+ Misses       1948     1926      -22     

☔ View full report in Codecov by Sentry.
📢 Have feedback on the report? Share it here.

🚀 New features to boost your workflow:

• ❄️ Test Analytics: Detect flaky tests, report on failures, and find test suite problems.
• 📦 JS Bundle Analysis: Save yourself from yourself by tracking and limiting bundle sizes in JS merges.