### Description
This implements a Node.js production runtime for Turbopack, to first be
used for `next build --turbo`, but that can easily be extended to
support more production use cases (e.g. ncc).
The runtime works differently from the dev runtime we're currently using
for `next dev`: instead of having each chunk register itself against a
global registry when evaluated, chunks export their module factories as
a CommonJS default export. The runtime itself lives in a separate chunk,
and then an "exported chunk" is generated that instantiates runtime
entries and exports a given entry module.
Corresponding Next.js PR:
~~https://github.com/vercel/next.js/pull/49942~~
https://github.com/vercel/next.js/pull/50375
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Co-authored-by: Tobias Koppers <tobias.koppers@googlemail.com>