refactor: update export syntax to default for multiple plugins and adjust package.json formatting

packages/artplayer-plugin-danmuku-mask/types/artplayer-plugin-danmuku-mask.d.ts

@@ -1,8 +1,5 @@
 import type Artplayer from 'artplayer'
 
-export = artplayerPluginDanmukuMask
-export as namespace artplayerPluginDanmukuMask;
-
 interface Option {
   solutionPath?: string
   modelSelection?: number
@@ -23,3 +20,5 @@ interface Result {
 }
 
 declare const artplayerPluginDanmukuMask: (option?: Option) => (art: Artplayer) => Result
+
+export default artplayerPluginDanmukuMask