jupyterlab-pioneer sample event

ActiveCellChangeEvent.json

{
  "eventDetail": {
    "eventName": "ActiveCellChangeEvent",
    "eventTime": 1699894451772,
    "eventInfo": {
      "cells": [
        {
          "id": "3d5a4322-0229-4d8c-86a3-b4302ecd2e1b",
          "index": 0
        }
      ]
    }
  },
  "notebookState": {
    "sessionID": "b162a909-96aa-45c1-ab8e-d0896a20c0cc",
    "notebookPath": "foo.ipynb",
    "notebookContent": null
  }
}