feat(dbm): add peer entity dbm comment attributes

[rarguelloF]

Adds the following 2 new attributes to the DBM injected query comments:

• ddh: represents the peer hostname of the request.
• dddb: represents the db instance.

These tags are necessary so the APM<->DBM connection still works when using the peer.service powered features.

Integrations affected:

• psycopg
• psycopg2

The following integrations support DBM comment injection but do not set tags with information about the db name or peer hostname, so the comment attributes won't be added:

• dbapi
• dbapi_async

Checklist

• Change(s) are motivated and described in the PR description
• Testing strategy is described if automated tests are not included in the PR
• Risks are described (performance impact, potential for breakage, maintainability)
• Change is maintainable (easy to change, telemetry, documentation)
• Library release note guidelines are followed or label changelog/no-changelog is set
• Documentation is included (in-code, generated user docs, public corp docs)
• Backport labels are set (if applicable)
• If this PR changes the public interface, I've notified @DataDog/apm-tees.
• If change touches code that signs or publishes builds or packages, or handles credentials of any kind, I've requested a review from @DataDog/security-design-and-guidance.

Reviewer Checklist

• Title is accurate
• All changes are related to the pull request's stated goal
• Description motivates each change
• Avoids breaking API changes
• Testing strategy adequately addresses listed risks
• Change is maintainable (easy to change, telemetry, documentation)
• Release note makes sense to a user of the library
• 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

[pr-commenter]

Benchmarks

Benchmark execution time: 2024-02-26 13:17:11

Comparing candidate commit e9e86ec in PR branch rarguelloF/AIT-9563/dbm-peer-entity-tags with baseline commit bb428ca in branch main.

Found 3 performance improvements and 3 performance regressions! Performance is the same for 197 metrics, 9 unstable metrics.

scenario:flasksimple-appsec-get

• 🟥 execution_time [+226.148µs; +273.326µs] or [+3.585%; +4.333%]

scenario:flasksimple-appsec-telemetry

• 🟥 execution_time [+212.775µs; +260.503µs] or [+3.370%; +4.126%]

scenario:otelspan-start

• 🟩 max_rss_usage [-4.368MB; -4.247MB] or [-8.740%; -8.498%]

scenario:samplingrules-average_match

• 🟩 max_rss_usage [-1.071MB; -0.953MB] or [-3.570%; -3.178%]

scenario:samplingrules-high_match

• 🟩 max_rss_usage [-1.101MB; -0.975MB] or [-3.672%; -3.251%]

scenario:span-add-metrics

• 🟥 max_rss_usage [+25.765MB; +25.876MB] or [+65.827%; +66.108%]

[datadog-dd-trace-py-rkomorn]

Datadog Report

Branch report: rarguelloF/AIT-9563/dbm-peer-entity-tags
Commit report: e9e86ec
Test service: dd-trace-py

✅ 0 Failed, 27323 Passed, 33044 Skipped, 6h 48m 31.45s Total duration (1h 56m 42.81s time saved)