Aj/cold start tracing

[astuyve]

What does this PR do?

Motivation

Testing Guidelines

Additional Notes

Types of Changes

• Bug fix
• New feature
• Breaking change
• Misc (docs, refactoring, dependency upgrade, etc.)

Check all that apply

• This PR's description is comprehensive
• This PR contains breaking changes that are documented in the description
• This PR introduces new APIs or parameters that are documented and unlikely to change in the foreseeable future
• This PR impacts documentation, and it has been updated (or a ticket has been logged)
• This PR's changes are covered by the automated tests
• This PR collects user input/sensitive content into Datadog
• This PR passes the integration tests (ask a Datadog member to run the tests)

[codecov-commenter]

Codecov Report

Merging #336 (9741d2c) into main (e247c98) will increase coverage by 1.58%.
The diff coverage is 85.71%.

@@ Coverage Diff @@ ## main #336 +/- ## ========================================== + Coverage 79.02% 80.60% +1.58%  ========================================== Files 36 38 +2 Lines 1807 1903 +96 Branches 418 439 +21 ========================================== + Hits 1428 1534 +106  + Misses 326 313 -13  - Partials 53 56 +3 

Impacted Files	Coverage Δ
src/runtime/user-function.ts	7.69% <ø> (+7.69%)	⬆️
src/trace/listener.ts	64.16% <27.27%> (-4.02%)	⬇️
src/trace/cold-start-tracer.ts	88.09% <88.09%> (ø)
src/runtime/require-tracer.ts	96.96% <96.96%> (ø)
src/index.ts	87.59% <100.00%> (+1.04%)	⬆️
src/runtime/index.ts	100.00% <100.00%> (+100.00%)	⬆️
src/runtime/errors.ts	36.58% <0.00%> (+36.58%)	⬆️

📣 We’re building smart automated test selection to slash your CI/CD build times. Learn more