Service Extension Callout (Envoy external processing)

[e-n-0]

What does this PR do?

Motivation

Reviewer's Checklist

• [ ] Changed code has unit tests for its functionality at or near 100% coverage.
• [ ] System-Tests covering this feature have been added and enabled with the va.b.c-dev version tag.
• [ ] There is a benchmark for any new code, or changes to existing code.
• [ ] If this interacts with the agent in a new way, a system test has been added.
• [ ] Add an appropriate team label so this PR gets put in the right place for the release notes.
• [ ] Non-trivial go.mod changes, e.g. adding new modules, are reviewed by @DataDog/dd-trace-go-guild.

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[pr-commenter[bot]]

Benchmarks

Benchmark execution time: 2024-12-16 13:53:07

Comparing candidate commit bece5b07038958fd48857855b146316de00c80d7 in PR branch flavien/service-extensions with baseline commit a8665eb0b88c50b6e30477fd464f1e7e985d6a51 in branch main.

Found 0 performance improvements and 0 performance regressions! Performance is the same for 58 metrics, 1 unstable metrics.

[eliottness]

Consolidated system-test run: https://github.com/DataDog/dd-trace-go/actions/runs/11797728094

[datadog-datadog-prod-us1[bot]]

Datadog Report

Branch report: flavien/service-extensions Commit report: 2cbd26c Test service: dd-trace-go

:white_check_mark: 0 Failed, 5112 Passed, 70 Skipped, 2m 53.79s Total Time