feat(node): Undici integration

[AbhiPrasad]

ref #6939

ref #7526

This PR adds support for Undici. This is required for us to instrument server-side fetch, introduced with Node 18+!

Requires Undici v4.7.0 and above.

SvelteKit uses Undici for fetch, and this will also help us with Next.js instrumentation.

I keep getting reminded of https://en.wikipedia.org/wiki/Jodeci whenever I work on this.

Follow up tasks: #7624

[mydea]

Can we use await import here? Because of e.g. this comment:
https://github.com/getsentry/sentry-javascript/blob/develop/packages/node/src/integrations/localvariables.ts#L33

[AbhiPrasad]

I don't think so, because we need to support cjs.

I think that docstring is no longer an issue - but I'll let @Lms24 confirm that.

[Lms24]

IIRC await import would actually be transpiled to Promise.resolve(() => require(..)) for our CJS build. The reason why we switched back to require is that only require'd modules are monkey-patchable while imported ones are not. So I'd say we probably can try await import here as we don't monkey-patch the required module.

However, we also don't have to if it the async nature of import makes things harder here. For instance, I ran into timing problems when trying to convert the LocalVariables integration to import and decided to leave it as is and revisit later.

Thanks for the comment link. I need to change the comment as I don't think it actually is true for SvelteKit anymore. I added this comment before I realized that yarn link caused these weird cjs/esm problems in SvelteKit.

[mydea]

IMHO if we can still make it work with import, I'd still do it - the less require we have in our code base, the better!

[Lms24]

Nice! If this is hard to unit-test, maybe we just add integration tests?

[AbhiPrasad]

Will refactor after DefinitelyTyped/DefinitelyTyped#64879 gets merged in

[AbhiPrasad]

Validated with

Testing this is such a pain, I'm going to do it in a follow-up PR so we can just ship this for now.

Unit tests seem impossible, so integration tests have to be the way. I may even have to make this a e2e test...

[AbhiPrasad]

Extracted out follow up tasks into #7624

[Lms24]

LGTM, thanks for applying review suggestions!

Yes, let's merge this w/o tests for the moment and add them when we have integration tests.

Also, let's maybe not yet close #7526 as I'm still figuring out #7598 (will add a point to the tasklist)