feat(parser): Add LiveChatSponsorshipsGiftPurchaseAnnouncement and LiveChatSponsorshipsHeader nodes

[jonz94]

Add a new parser for the live chat node that appears when someone sends gifted memberships.

Example RawNode data:

{
  "liveChatSponsorshipsGiftPurchaseAnnouncementRenderer": {
    "id": "ChwKGkNKdUVzTmJRbW9rREZZMlY1UWNkU3dJSDZ3",
    "timestampUsec": "1729347301072447",
    "authorExternalChannelId": "UCnkXGpBlY-1aJGuQASWs1gw",
    "header": {
      "liveChatSponsorshipsHeaderRenderer": {
        "authorName": {
          "simpleText": "Lance蘭斯"
        },
        "authorPhoto": {
          "thumbnails": [
            {
              "url": "https://yt4.ggpht.com/1ghjNFZV9AH4fOlq2eJYS7SG0z_VuBm7zKINkYZdxJ3_edCLhqYfNw-YfbcSzAg7QCnQ_XtB=s32-c-k-c0x00ffffff-no-rj",
              "width": 32,
              "height": 32
            },
            {
              "url": "https://yt4.ggpht.com/1ghjNFZV9AH4fOlq2eJYS7SG0z_VuBm7zKINkYZdxJ3_edCLhqYfNw-YfbcSzAg7QCnQ_XtB=s64-c-k-c0x00ffffff-no-rj",
              "width": 64,
              "height": 64
            }
          ]
        },
        "primaryText": {
          "runs": [
            {
              "text": "Gifted ",
              "bold": true
            },
            {
              "text": "5",
              "bold": true
            },
            {
              "text": " ",
              "bold": true
            },
            {
              "text": "庫洛姆•Kuromu",
              "bold": true
            },
            {
              "text": " memberships",
              "bold": true
            }
          ]
        },
        "authorBadges": [
          {
            "liveChatAuthorBadgeRenderer": {
              "icon": {
                "iconType": "MODERATOR"
              },
              "tooltip": "Moderator",
              "accessibility": {
                "accessibilityData": {
                  "label": "Moderator"
                }
              }
            }
          },
          {
            "liveChatAuthorBadgeRenderer": {
              "customThumbnail": {
                "thumbnails": [
                  {
                    "url": "https://yt3.ggpht.com/X9RkCDxc0D7OtVbbJAxZGXbV4-PZw0cg2h_Vg1C6ahIVaYrcTubP1WF3313-LjKz9PRHgY_fVw=s16-c-k",
                    "width": 16,
                    "height": 16
                  },
                  {
                    "url": "https://yt3.ggpht.com/X9RkCDxc0D7OtVbbJAxZGXbV4-PZw0cg2h_Vg1C6ahIVaYrcTubP1WF3313-LjKz9PRHgY_fVw=s32-c-k",
                    "width": 32,
                    "height": 32
                  }
                ]
              },
              "tooltip": "Member (6 months)",
              "accessibility": {
                "accessibilityData": {
                  "label": "Member (6 months)"
                }
              }
            }
          }
        ],
        "contextMenuEndpoint": {
          "clickTrackingParams": "CAoQ3MMKIhMIkszl-JW7iQMVcNY0Bx04tAU-",
          "commandMetadata": {
            "webCommandMetadata": {
              "ignoreNavigation": true
            }
          },
          "liveChatItemContextMenuEndpoint": {
            "params": "Q2g0S0hBb2FRMHAxUlhOT1lsRnRiMnRFUmxreVZqVlJZMlJUZDBsSU5uY2FLU29uQ2hoVlF6SmFWMmRuYjI0eFRrOVVNbFJIWVZaVlRYcFpOMEVTQzI5SU1IRktTbkZGUWxKRklBRW9CRElhQ2hoVlEyNXJXRWR3UW14WkxURmhTa2QxVVVGVFYzTXhaM2M0QWtnQlVDUSUzRA=="
          }
        },
        "contextMenuAccessibility": {
          "accessibilityData": {
            "label": "Chat actions"
          }
        },
        "image": {
          "thumbnails": [
            {
              "url": "https://www.gstatic.com/youtube/img/sponsorships/sponsorships_gift_purchase_announcement_artwork.png"
            }
          ]
        }
      }
    }
  }
}

[absidue]

Thank you for your pull request. Most of it is great, I've just noted two small potential improvements.

[LuanRT]

Looks good to me! I'll go ahead and merge it once @absidue approves the changes, as they've also reviewed it.