feat: 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

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 89.47368% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 54.38%. Comparing base (1a6f881) to head (8d8be52).

Files with missing lines	Patch %	Lines
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	85.20% <ø> (+0.59%)	⬆️
instrumentation/packages.go	9.23% <ø> (ø)
contrib/go.uber.org/zap/zap.go	89.47% <89.47%> (ø)

... and 74 files with indirect coverage changes

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[datadog-datadog-prod-us1]

✅ Tests

🎉 All green!

❄️ No new flaky tests detected
🧪 All tests passed

<sub>This comment will be updated automatically if new data arrives.
* Fix with Cursor requires Datadog plugin ≥v2.17.0
🔗 Commit SHA: 8d8be52 | Docs | Datadog PR Page | Was this helpful? Give us feedback!</sub>

[pr-commenter]

Benchmarks

Benchmark execution time: 2025-12-10 19:23:22

Comparing candidate commit 8d8be52 in PR branch zap-integration-refactor with baseline commit 1a6f881 in branch main.

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