chore(iast): restructure functions

[avara1986]

Overview

This PR reorganizes functions in the IAST module to improve code organization and maintainability. The changes include:

• Restructuring functions for better logical grouping
• Improving code organization
• No functional changes, purely organizational improvements

Motivation

The reorganization helps improve code readability and maintainability by grouping related functions together in a more logical way.

Testing Strategy

Since this is a reorganization change with no functional modifications, existing tests continue to validate the behavior remains unchanged.

Related to: #13239 / APPSEC-56947

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/_iast/_handlers.py                                       @DataDog/asm-python
ddtrace/appsec/_iast/_iast_request_context_base.py                      @DataDog/asm-python
ddtrace/appsec/_iast/_metrics.py                                        @DataDog/asm-python
ddtrace/appsec/_iast/_patch.py                                          @DataDog/asm-python
ddtrace/appsec/_iast/_span_metrics.py                                   @DataDog/asm-python
ddtrace/appsec/_iast/_taint_utils.py                                    @DataDog/asm-python
ddtrace/appsec/_iast/_utils.py                                          @DataDog/asm-python

[github-actions]

Bootstrap import analysis

Comparison of import times between this PR and base.

Summary

The average import time from this PR is: 231 ± 3 ms.

The average import time from base is: 233 ± 3 ms.

The import time difference between this PR and base is: -1.6 ± 0.1 ms.

Import time breakdown

The following import paths have shrunk:

ddtrace.auto 1.926 ms (0.83%)

ddtrace.bootstrap.sitecustomize 1.256 ms (0.54%)

ddtrace.bootstrap.preload 1.256 ms (0.54%)

ddtrace.internal.products 1.256 ms (0.54%)

ddtrace.internal.remoteconfig.client 0.608 ms (0.26%)

ddtrace 0.670 ms (0.29%)

[pr-commenter]

Benchmarks

Benchmark execution time: 2025-04-21 13:22:57

Comparing candidate commit a51c430 in PR branch avara1986/reorg_files with baseline commit 997a12e in branch main.

Found 0 performance improvements and 3 performance regressions! Performance is the same for 497 metrics, 8 unstable metrics.

scenario:iast_aspects-ospathdirname_aspect

• 🟥 execution_time [+859.727ns; +975.602ns] or [+18.809%; +21.344%]

scenario:iast_aspects-ospathjoin_aspect

• 🟥 execution_time [+633.443ns; +814.132ns] or [+10.493%; +13.486%]

scenario:telemetryaddmetric-1-rate-metric-1-times

• 🟥 execution_time [+345.982ns; +427.145ns] or [+11.138%; +13.751%]