chore(asm): refactor for waf telemetry logs

[christophe-papazian]

• refactor the code for telemetry logs for the waf.
• add error logs for waf run.
• improve messages following RFC "In-APP WAF Error Telemetry RFC"
• update tests accordingly
• improve code to handle internal errors of libddwaf
• add test for telemetry log on waf internal errors using mock (we don't have a way to force libddwaf to generate an internal error)

APPSEC-55199

Checklist

• PR author has checked that all the criteria below are met
• 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
• Backport labels are set (if applicable)

Reviewer Checklist

• 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
• Release note makes sense to a user of the library
• If necessary, author has acknowledged and discussed the performance implications of this PR as reported in the benchmarks PR comment
• Backport labels are set in a manner that is consistent with the release branch maintenance policy

[github-actions]

CODEOWNERS have been resolved as:

ddtrace/appsec/_ddwaf/__init__.py                                       @DataDog/asm-python
ddtrace/appsec/_metrics.py                                              @DataDog/asm-python
ddtrace/appsec/_processor.py                                            @DataDog/asm-python
tests/appsec/appsec/test_telemetry.py                                   @DataDog/asm-python
tests/appsec/contrib_appsec/conftest.py                                 @DataDog/asm-python

[pr-commenter]

Benchmarks

Benchmark execution time: 2024-10-28 10:19:21

Comparing candidate commit 7ef8470 in PR branch christophe-papazian/improve_waf_error_telemetry with baseline commit 83ce118 in branch main.

Found 0 performance improvements and 0 performance regressions! Performance is the same for 388 metrics, 2 unstable metrics.