feat: 优化字幕偏移逻辑，增加对模板的支持，修复字幕切换事件参数

packages/artplayer/src/subtitle.js

@@ -153,7 +153,7 @@ export default class Subtitle extends Component {
                 if (this.url === subUrl) return subUrl;
                 URL.revokeObjectURL(this.url);
                 this.createTrack('metadata', subUrl);
-                this.art.emit('subtitleSwitch', subUrl);
+                this.art.emit('subtitleSwitch', subUrl, subtitleOption.url);
                 return subUrl;
             })
             .catch((err) => {