feat(parser): Update Button

[jonz94]

This PR updates the Button parser:

• Add style property
• Add size property
• Add target_id property
• Parse data.accessibilityData.accessibilityData.label if data.accessibility.label is unavailable

Example RawNode data 1:

{
  "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"
      }
    }
  }
}

Example RawNode data 2:

{
  "buttonRenderer": {
    "style": "STYLE_DEFAULT",
    "size": "SIZE_DEFAULT",
    "isDisabled": false,
    "text": {
      "runs": [
        {
          "text": "Go now"
        }
      ]
    },
    "command": {
      "commandMetadata": {
        "webCommandMetadata": {
          "url": "/watch?v=U9xhA27lySE",
          "webPageType": "WEB_PAGE_TYPE_WATCH",
          "rootVe": 3832
        }
      },
      "watchEndpoint": {
        "videoId": "U9xhA27lySE"
      }
    }
  }
}

Example RawNode data 3:

{
  "buttonRenderer": {
    "style": "STYLE_PRIMARY",
    "size": "SIZE_DEFAULT",
    "isDisabled": false,
    "text": {
      "runs": [
        {
          "text": "Got it"
        }
      ]
    },
    "accessibility": {
      "label": "Got it"
    },
    "tooltip": "Got it",
    "trackingParams": "CDQQ8FsiEwjujqzBusWJAxUrrFYBHVfDOn8=",
    "accessibilityData": {
      "accessibilityData": {
        "label": "Got it"
      }
    }
  }
}

Example RawNode data 4:

{
  "buttonRenderer": {
    "style": "STYLE_MONO_FILLED",
    "size": "SIZE_DEFAULT",
    "isDisabled": false,
    "text": {
      "simpleText": "Got it"
    },
    "trackingParams": "CEkQ8FsiEwiQlJ7Zt76JAxXruFYBHb4hGR0=",
    "accessibilityData": {
      "accessibilityData": {
        "label": "Got it"
      }
    }
  }
}

Example RawNode data 5:

{
  "buttonRenderer": {
    "icon": {
      "iconType": "MORE_VERT"
    },
    "accessibility": {
      "label": "Chat actions"
    },
    "accessibilityData": {
      "accessibilityData": {
        "label": "Chat actions"
      }
    },
    "targetId": "live-chat-action-panel-poll-context-menu",
    "command": {
      "commandMetadata": {
        "webCommandMetadata": {
          "ignoreNavigation": true
        }
      },
      "liveChatItemContextMenuEndpoint": {
        "params": "Q2g0S0hBb2FRMGx0ZVRsa1IzVnhiMjlFUmxSWVJIZG5VV1J3ZGpnd1NHY2FLU29uQ2hoVlEzSjVZMFIyTVhOWlZrZElOVWRMT0ZoQ1ZGaEJRbWNTQ3psblZVdzNNakZxY0dOQklBRW9CRElhQ2hoVlEzSjVZMFIyTVhOWlZrZElOVWRMT0ZoQ1ZGaEJRbWM0QTBnQVVCVSUzRA=="
      }
    }
  }
}