Is your feature request related to a problem? Please describe.
I want to use the inspector module in a worker thread to control the inspector in another thread.

const { isMainThread, Worker } = require('worker_threads');
const inspector = require('inspector');

if (isMainThread) {
  new Worker(__filename)
} else {
  // session connects to the worker thread inspector, not the main thread.
  const session = new inspector.Session();
  session.connect();
}

inspector.Session doesn't support connecting to the inspector of a different thread or process.

Describe the solution you'd like

• add a url parameter to inspector.Session

if (isMainThread) {
  inspector.open(0);
  const url = inspector.url();
  new Worker(__filename, { workerData: { url }})
} else {
  const session = new inspector.Session(workerData.url);
  // ...
}

• or allow inspector to be transfered

if (isMainThread) {
  new Worker(__filename, { workerData: { inspector }})
} else {
  const session = new new workerData.inspector.Session();
  // ...
}

Describe alternatives you've considered
The v8 inspector API is not complicated and I have written a client using the ws npm module instead of using inspector.Session.

I'm open to writing a CR to implement this, but I would like feedback from a maintainer before I start, especially because both worker_threads and inspector are experimental.