- Move `setupProcessStdio` which contains write access to
the process object into `bootstrap/node.js`
- Move `MessagePort`, `MessageChannel`, `ReadableWorkerStdio`,
and `WritableWorkerStdio` into `internal/worker/io.js`
- Move more worker-specific bootstrap code into
`internal/process/worker_thread_only` from `setupChild`
in `internal/worker.js`, and move the `process._fatalException`
overwrite into `bootstrap/node.js` for clarity.
PR-URL: https://github.com/nodejs/node/pull/25199
Reviewed-By: James M Snell <jasnell@gmail.com>