feat(parser): Update LiveChatBanner

[jonz94]

This PR updates the LiveChatBanner parser:

• Mark viewerIsCreator property as optional
• Mark background_type property as optional
• Add banner_type property
• Add banner_properties_is_ephemeral property
• Add banner_properties_auto_collapse_delay_seconds property

Example RawNode data 1:

{
  "liveChatBannerRenderer": {
    "contents": {
      "liveChatBannerRedirectRenderer": {
        /* truncated */
      }
    },
    "actionId": "ChwKGkNQR3E1Sy1jMG9rREZiWEFsQWtkRWVBeW5R",
    "targetId": "live-chat-banner",
    "isStackable": true,
    "bannerType": "LIVE_CHAT_BANNER_TYPE_CROSS_CHANNEL_REDIRECT"
  }
}

Example RawNode data 2:

{
  "liveChatBannerRenderer": {
    "header": {
      "liveChatBannerHeaderRenderer": {
        /* truncated */
      }
    },
    "contents": {
      "liveChatTextMessageRenderer": {
        /* truncated */
      }
    },
    "actionId": "ChwKGkNQM2xxTm5LbFlrREZVYkx3Z1FkUTk4SjJR",
    "viewerIsCreator": false,
    "targetId": "live-chat-banner",
    "isStackable": false,
    "backgroundType": "LIVE_CHAT_BANNER_BACKGROUND_TYPE_STATIC",
    "bannerProperties": {
      "autoCollapseDelay": {
        "seconds": "7"
      }
    },
    "bannerType": "LIVE_CHAT_BANNER_TYPE_PINNED_MESSAGE"
  }
}

Example RawNode data 3:

{
  "liveChatBannerRenderer": {
    "contents": {
      "liveChatBannerRedirectRenderer": {
        /* truncated */
      }
    },
    "actionId": "ChwKGkNOaXB3TktodllrREZSak00d2NkN1djOGxR",
    "targetId": "live-chat-banner",
    "isStackable": true,
    "bannerType": "LIVE_CHAT_BANNER_TYPE_CROSS_CHANNEL_REDIRECT"
  }
}

Example RawNode data 4:

{
  "liveChatBannerRenderer": {
    "contents": {
      "liveChatBannerChatSummaryRenderer": {
        /* truncated */
      }
    },
    "actionId": "gKonxsPlU-M_1731888622579899",
    "targetId": "live-chat-banner",
    "isStackable": true,
    "bannerProperties": {
      "isEphemeral": true,
      "autoCollapseDelay": {
        "seconds": "30"
      }
    },
    "bannerType": "LIVE_CHAT_BANNER_TYPE_CHAT_SUMMARY"
  }
}