Add node support in threads (#21139)

This enables the possibility of multithreading in Atom as stated in [Electron documentation](https://www.electronjs.org/docs/tutorial/multithreading). It allows using Node features in WebWorkers.

src/main-process/atom-window.js

@@ -49,7 +49,10 @@ module.exports = class AtomWindow extends EventEmitter {
         // (Ref: https://github.com/atom/atom/pull/12696#issuecomment-290496960)
         disableBlinkFeatures: 'Auxclick',
         nodeIntegration: true,
-        webviewTag: true
+        webviewTag: true,
+
+        // node support in threads
+        nodeIntegrationInWorker: true
       },
       simpleFullscreen: this.getSimpleFullscreen()
     };