feat: add danmuku plugin documentation and i18n setup guide

- Created a new documentation file for the danmuku plugin with code examples.
- Added comprehensive language settings documentation, including default languages, importing languages, adding new languages, and modifying existing languages.
- Updated the structure of the i18n documentation to improve clarity and usability.

docs/assets/ts/artplayer.d.ts

@@ -1162,6 +1162,7 @@ export default class Artplayer extends Player {
     ) => () => void
     hover: (element: HTMLElement, mouseenter?: (event: Event) => any, mouseleave?: (event: Event) => any) => void
     remove: (event: Event) => void
+    bindGlobalEvents: (source?: { window?: Window, document?: Document }) => void
   }
 
   readonly storage: {