Add way to determine if conversation disconnected

[SketchingDev]

Implement a way to determine if the conversation has been disconnected and cannot be continued.

Currently if the Conversation Disconnect configuration is set to 'Display conversation status and disconnect session' then the session is disconnected and any subsequent .sendText(...) results in the response:

{"type":"response","class":"string","code":409,"body":"Session is read-only, no new messages allowed"}

Update API to surface the Disconnect presence in the StructuredMessage sent from the bot:

{
  "type": "message",
  "class": "StructuredMessage",
  "code": 200,
  "body": {
    "type": "Event",
    "direction": "Outbound",
    "id": "xxxxxxxxxxxxxxxxxxxxxxxxxxxxxx",
    "channel": {
      "time": "2024-02-09T22:39:50.526Z",
      "type": "Private",
      "from": {
        "nickname": "Robot Friend"
      },
      "to": {}
    },
    "events": [
      {
        "eventType": "Presence",
        "presence": {
          "type": "Disconnect"
        }
      }
    ],
    "metadata": {
      "readOnly": "true"
    },
    "originatingEntity": "Bot"
  }
}

[SketchingDev]

#169

[SketchingDev]

https://github.com/ovotech/genesys-web-messaging-tester/releases/tag/genesys-web-messaging-tester-cli-v2.0.3