[Feature Request] - add "metadata" key=value pairs when creating session

[devlikepro]

For integration purpose with application it can be useful to give a way to add additional "application related" data in session. After that, we'll send

1. metadata back to the system in webhook event, so the app can easily match records in their database
2. Show it on Dashboard so you can quickly search the desired session by using application and user data

For instance

{
  "name": "default",
  "metadata": {
    "user.id": 123,
    "user.email": "email@gmail.com"
  }
}

would give session.status event

{
    "event": "session.status",
    "session": "default",
    "me": {
        "id": "7911111@c.us",
        "pushName": "~"
    },
     "metadata": {
      "user.id": 123,
      "user.email": "email@gmail.com"
    }
    "payload": {
        "status": "WORKING"
    },
    "engine": "WEBJS",
    "environment": {
        "version": "2023.10.12",
        "engine": "WEBJS",
        "tier": "PLUS"
    }
}

[devlikepro]

Ideally we should add it before after this one, so app doesn't have to put metadata over and over https://github.com/devlikeapro/waha/issues/435

[devlikepro]

Will be in 2024.9.1, metadata when you create or update a session, which will be availble in Dashboard, Webhooks and API responses.

[devlikepro]

https://waha.devlike.pro/docs/how-to/sessions/#metadata