chore: 删除不再使用的 TypeScript 声明文件，并添加新的插件声明文件

docs/assets/ts/artplayer-plugin-dash-control.d.ts

@@ -0,0 +1,17 @@
+import type Artplayer from 'artplayer';
+
+export = artplayerPluginDashControl;
+export as namespace artplayerPluginDashControl;
+
+type Config = {
+    control?: boolean;
+    setting?: boolean;
+    title?: string;
+    auto?: string;
+    getName?(level: object): String;
+};
+
+declare const artplayerPluginDashControl: (option: { quality?: Config; audio?: Config }) => (art: Artplayer) => {
+    name: 'artplayerPluginDashControl';
+    update: () => void;
+};