feat(parser): Update LiveChatViewerEngagementMessage

[jonz94]

Update LiveChatViewerEngagementMessage to extend YTNode rather than LiveChatMessageBase to better align with the latest data provided by Innertube.

Example RawNode data 1:

{
  "liveChatViewerEngagementMessageRenderer": {
    "id": "Ci0KK1NVQlNDUklCRVJTX09OTFlfVkVNMjAyNC8xMi8xNS0wMDoyOToxNi45ODc%3D",
    "timestampUsec": "1734251356987117",
    "icon": {
      "iconType": "YOUTUBE_ROUND"
    },
    "message": {
      "runs": [
        {
          "text": "Subscribers-only mode. Messages that appear are from people who’ve subscribed to this channel for "
        },
        {
          "text": "1 minute"
        },
        {
          "text": " or longer."
        }
      ]
    },
    "actionButton": {
      "buttonRenderer": {
        "style": "STYLE_BLUE_TEXT",
        "size": "SIZE_DEFAULT",
        "isDisabled": false,
        "text": {
          "simpleText": "Learn more"
        },
        "navigationEndpoint": {
          "clickTrackingParams": "CB8Q8FsiEwiE3dTgramKAxXD1UwCHcXaFsg=",
          "commandMetadata": {
            "webCommandMetadata": {
              "url": "//support.google.com/youtube/?p=subs_only_chat_viewer&hl=en",
              "webPageType": "WEB_PAGE_TYPE_UNKNOWN",
              "rootVe": 83769
            }
          },
          "urlEndpoint": {
            "url": "//support.google.com/youtube/?p=subs_only_chat_viewer&hl=en",
            "target": "TARGET_NEW_WINDOW"
          }
        },
        "trackingParams": "CB8Q8FsiEwiE3dTgramKAxXD1UwCHcXaFsg=",
        "accessibilityData": {
          "accessibilityData": {
            "label": "Learn more"
          }
        }
      }
    },
    "trackingParams": "CAEQl98BIhMIhN3U4K2pigMVw9VMAh3F2hbI"
  }
}

Example RawNode data 2:

{
  "liveChatViewerEngagementMessageRenderer": {
    "id": "ChwKGkNJZTg0WXp2cW9vREZRX0N3Z1FkNUFrMXZ3",
    "icon": {
      "iconType": "POLL"
    },
    "message": {
      "runs": [
        {
          "text": "abc",
          "bold": true
        },
        {
          "text": "\n"
        },
        {
          "text": "Yes (100%)"
        },
        {
          "text": "\n"
        },
        {
          "text": "No (0%)"
        },
        {
          "text": "\n"
        },
        {
          "text": "\n"
        },
        {
          "text": "Poll complete: 1 vote"
        }
      ]
    },
    "contextMenuEndpoint": {
      "clickTrackingParams": "CAEQl98BIhMI1ZGfn--qigMVXfNMAh2YlQ9g",
      "commandMetadata": {
        "webCommandMetadata": {
          "ignoreNavigation": true
        }
      },
      "liveChatItemContextMenuEndpoint": {
        "params": "Q2g0S0hBb2FRMGxsT0RSWmVuWnhiMjlFUmxGZlEzZG5VV1ExUVdzeGRuY2FLU29uQ2hoVlEwTjRiR3hUU2xnNFVWUTJXVkZSWmpjNWRIcGxWRkVTQzB4ek4wWk1PV1pKTm10M0lBRW9CRElhQ2hoVlEwTjRiR3hUU2xnNFVWUTJXVkZSWmpjNWRIcGxWRkU0QWtnQVVCWSUzRA=="
      }
    },
    "contextMenuAccessibility": {
      "accessibilityData": {
        "label": "Chat actions"
      }
    },
    "trackingParams": "CAEQl98BIhMI1ZGfn--qigMVXfNMAh2YlQ9g"
  }
}

Example RawNode data 3:

{
  "liveChatViewerEngagementMessageRenderer": {
    "id": "CiMKIVJFUExBWV9WRU0yMDI0LzExLzAxLTEwOjEzOjE2LjMxMA%3D%3D",
    "timestampUsec": "1730481196310968",
    "icon": {
      "iconType": "YOUTUBE_ROUND"
    },
    "message": {
      "runs": [
        {
          "text": "Live chat replay is on. Messages that appeared when the stream was live will show up here."
        }
      ]
    },
    "trackingParams": "CAEQl98BIhMIi4n159C7iQMV6chMAh0qYDmn"
  }
}