WIP: feat(contrib/go.uber.org/zap): add zap integration

[quinna-h]

What does this PR do?

Revamp of @rarguelloF PR for v2: contrib/go.uber.org/zap: add basic integration

Makes the following changes:

• Support 128-bit trace IDs
• Update to use v2 instead of v1
• Register package in packages.go
• Support for manual trace injection

Limitations:

• Automatic trace context injection is not currently supported; zapcore.Core.Write() doesn't receive a context.Context
• GLS-based injection requires internal package access which isn't easily achievable without major changes

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.
• New code is free of linting errors. You can check this by running ./scripts/lint.sh locally.
• 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.

Unsure? Have a question? Request a review!

[codecov]

Codecov Report

❌ Patch coverage is 42.50000% with 23 lines in your changes missing coverage. Please review.
✅ Project coverage is 55.02%. Comparing base (6337a08) to head (282492f).
⚠️ Report is 113 commits behind head on main.

Files with missing lines	Patch %	Lines
contrib/go.uber.org/zap/core.go	0.00%	17 Missing ⚠️
internal/orchestrion/context.go	0.00%	4 Missing ⚠️
contrib/go.uber.org/zap/zap.go	89.47%	1 Missing and 1 partial ⚠️

Additional details and impacted files

Files with missing lines	Coverage Δ
ddtrace/tracer/option.go	83.81% <ø> (ø)
instrumentation/packages.go	9.23% <ø> (ø)
contrib/go.uber.org/zap/zap.go	89.47% <89.47%> (ø)
internal/orchestrion/context.go	50.00% <0.00%> (-8.34%)	⬇️
contrib/go.uber.org/zap/core.go	0.00% <0.00%> (ø)

... and 26 files with indirect coverage changes

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[datadog-datadog-prod-us1]

✅ Tests

🎉 All green!

❄️ No new flaky tests detected
🧪 All tests passed

_{This comment will be updated automatically if new data arrives.
🔗 Commit SHA: 282492f | Docs | Datadog PR Page | Was this helpful? Give us feedback!}

[pr-commenter]

Benchmarks

Benchmark execution time: 2026-01-14 20:07:06

Comparing candidate commit 6402c1a in PR branch zap-integration-refactor with baseline commit da75c64 in branch main.

Found 0 performance improvements and 0 performance regressions! Performance is the same for 18 metrics, 0 unstable metrics.

[rarguelloF]

superseded by #4729