This breaks out routing handling from `next-server`, `next-dev-server`,
and `base-server` so that these are only handling the "render" work and
eventually these will be deleted completely in favor of the bundling
work being done.
The `router` process and separate `render` processes are still
maintained here although will be investigated further in follow-up to
see if we can reduce the need for these.
We are also changing the `require-cache` IPC to a single call instead of
call per entry to reduce overhead and also de-dupes handling for
starting the server between the standalone server and normal server.
To maintain support for existing turbopack route resolving this
implements the new route resolving in place of the existing
`route-resolver` until the new nextturbo API is fully landed.
After these initial changes we should continue to eliminate non-render
related code from `next-server`, `base-server`, and `next-dev-server`.
## Why
Some users prefer to use a custom server implementation that handles body parsing. If they do this, they have no way to opt out of all body parsing in API Routes. Requests with bodies die if next's `bodyParser` is not disabled. Requests just hang forever.
Instead of adding [this config](https://nextjs.org/docs/api-routes/api-middlewares#custom-config) to every API Route, we do a simple check to avoid parsing the body twice.
Fixes#8315Fixes#7960
