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%)	:arrow_up:
src/trace/listener.ts	64.16% <27.27%> (-4.02%)	:arrow_down:
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%)	:arrow_up:
src/runtime/index.ts	100.00% <100.00%> (+100.00%)	:arrow_up:
src/runtime/errors.ts	36.58% <0.00%> (+36.58%)	:arrow_up:

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