Implement middleware support for Turbopack (#46397)
This implements middleware support for Turbopack's route resolver. In
https://github.com/vercel/turbo/pull/3930, I'm updating the data that we
pass to include a new `MiddlewareConfig`, which includes the files
needed for invoking the edge function and the matchers extracted from
the middleware's static `export config = {}`.
~~This needs to wait for https://github.com/vercel/turbo/pull/3930 to
land first~~ Merged.
Fixes https://linear.app/vercel/issue/WEB-624
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Co-authored-by: JJ Kasper <jj@jjsweb.site>
