feat: add response streaming

[duncanista]

What does this PR do?

Adds support for response streaming functions.

Motivation

AWS just launched response streaming support for AWS Lambda functions.

Testing Guidelines

• Added unit tests
• Tested manually on self-monitoring app.
• Tested a streamed image which payload was bigger than 6MB.

Additional Notes

This could be considered a bug, since our current work wouldn't work out of the box. Now it's working as expected.

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 #376 (9d0527a) into main (56f6227) will increase coverage by 0.35%.
The diff coverage is 85.00%.

❗ Current head 9d0527a differs from pull request most recent head 8640398. Consider uploading reports for the commit 8640398 to get more accurate results

@@            Coverage Diff             @@
##             main     #376      +/-   ##
==========================================
+ Coverage   80.53%   80.89%   +0.35%     
==========================================
  Files          38       38              
  Lines        1901     1931      +30     
  Branches      439      448       +9     
==========================================
+ Hits         1531     1562      +31     
  Misses        313      313              
+ Partials       57       56       -1     

Impacted Files	Coverage Δ
src/trace/listener.ts	65.00% <33.33%> (+0.83%)	⬆️
src/index.ts	88.15% <85.18%> (+0.56%)	⬆️
src/constants.ts	100.00% <100.00%> (ø)
src/trace/trigger.ts	89.22% <100.00%> (+1.19%)	⬆️
src/utils/handler.ts	91.22% <100.00%> (+0.84%)	⬆️

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