Turbopack: refactor segment config parsing (#83297)
Closes PACK-5382
Previously, Turbopack validated every single module for route segment config, leading to false positives (on non-page files) and worse build performance. There were also three separate implementations of this logic.
Now, all of these cases are fatal errors, not just warnings.
Examples for errors
```
./bench/basic-app/app/export/inherit/page.tsx:1:28
Next.js can't recognize the exported `preferredRegion` field in route. It needs to be a static string or array of static strings.
> 1 | export { default, runtime, preferredRegion } from '../basic/foo'
| ^^^^^^^^^^^^^^^
The exported configuration object in a source file needs to have a very specific format from which some properties can be statically parsed at compiled-time.
https://nextjs.org/docs/app/api-reference/file-conventions/route-segment-config
```
This error message is slightly different now:
```
browser log: ./test/integration/app-dir-export/app/another/[slug]/page.js:6:8
Next.js can't recognize the exported `generateStaticParams` field in route. App pages cannot use both "use client" and export function "generateStaticParams()".
4 |
5 |
> 6 | export function generateStaticParams() {
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> 7 | return [{ slug: 'first' }, { slug: 'second' }]
| ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
> 8 | }
| ^^
9 |
10 | export default async function Page(props) {
11 | const params = await props.params
The exported configuration object in a source file needs to have a very specific format from which some properties can be statically parsed at compiled-time.
Import traces:
Client Component Browser:
./test/integration/app-dir-export/app/another/[slug]/page.js [Client Component Browser]
./test/integration/app-dir-export/app/another/[slug]/page.js [Server Component]
Client Component SSR:
./test/integration/app-dir-export/app/another/[slug]/page.js [Client Component SSR]
./test/integration/app-dir-export/app/another/[slug]/page.js [Server Component]
https://nextjs.org/docs/app/api-reference/file-conventions/route-segment-config
```
