DefinitelyTyped Added AWS Lambda stream type to `aws-lambda`.

Getting the ball rolling on this, need some help to complete, not sure exactly if I got it right (plus then need to test). Please hint at the types of tests I should add. And I wasn't 100% sure I nailed the types correctly, the code is kind of messy haha. But I am 99% sure.

The types I added come from https://github.com/aws/aws-lambda-nodejs-runtime-interface-client/blob/7374a4e338fc3b070811d55ee337740f3f6cb382/src/ResponseStream.js#L37-L64

Hints at the API: https://betterdev.blog/lambda-response-streaming-flush-content/
[x] Use a meaningful title for the pull request. Include the name of the package modified.
[ ] Test the change in your own code. (Compile and run.)
- I am not sure about this, did I do things right? How do I import stream properly?
[ ] Add or edit tests to reflect the change.
[ ] Follow the advice from the readme.
[ ] Avoid common mistakes.
[ ] Run pnpm test <package to test>.

If changing an existing definition:

[x] Provide a URL to documentation or source code which provides context for the suggested changes: <>
[ ] If this PR brings the type definitions up to date with a new version of the JS library, update the version number in the package.json.

Feb 05 '24 19:02 lancejpollard

@lancejpollard Thank you for submitting this PR! I see this is your first time submitting to DefinitelyTyped 👋 — I'm the local bot who will help you through the process of getting things through.

This is a live comment which I will keep updated.

1 package in this PR

aws-lambda — on npm, on unpkg

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