feat(debugging): add support for Decimal

[P403n1x87]

We add support to Dynamic Instrumentation for the Decimal type from the standard library. With this change, values of this type will have a more explicit representation in dynamic logs, and can be used, after a convertion to float, in metrics and other expressions.

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:

releasenotes/notes/chore-di-support-decimal-e75525e282c50a2f.yaml       @DataDog/apm-python
ddtrace/debugging/_expressions.py                                       @DataDog/debugger-python
ddtrace/debugging/_signal/utils.py                                      @DataDog/debugger-python
tests/debugging/test_debugger.py                                        @DataDog/debugger-python

[github-actions]

Bootstrap import analysis

Comparison of import times between this PR and main.

Summary

The average import time in this PR is: 228 ± 3 ms.

The average import time in main is: 230 ± 3 ms.

The import time difference between this PR and main is: -2.1 ± 0.1 ms.

Import time breakdown

The following import paths have shrunk:

ddtrace.auto 1.986 ms (0.87%)

ddtrace.bootstrap.sitecustomize 1.342 ms (0.59%)

ddtrace.bootstrap.preload 1.342 ms (0.59%)

ddtrace.internal.products 1.342 ms (0.59%)

ddtrace.internal.remoteconfig.client 0.699 ms (0.31%)

ddtrace 0.644 ms (0.28%)

[pr-commenter]

Benchmarks

Benchmark execution time: 2025-03-26 22:18:53

Comparing candidate commit 06d4b60 in PR branch chore/di-support-decimal with baseline commit 269b3d8 in branch main.

Found 0 performance improvements and 0 performance regressions! Performance is the same for 498 metrics, 2 unstable metrics.