refactor(mask): [PKG-MASK-04] migrate strict types and preserve public consumers

refactor/fixtures/implementation/danmuku-mask.ts

@@ -0,0 +1,6 @@
+import type Artplayer from 'artplayer'
+import factory from '../../../packages/artplayer-plugin-danmuku-mask/src'
+
+declare const art: Artplayer
+const registration: { name: string, start: () => Promise<void>, stop: () => void } = factory({ opacity: 0, smoothSegmentation: false })(art)
+export { registration }