feat: Refactor global event handling in ArtPlayer

- Introduced a new globalInit function to manage document and window events.
- Replaced direct event proxies with a unified bindGlobalEvents method.
- Updated event handling in various modules to utilize the new global event system.
- Removed the deprecated documentInit module.
- Bumped version to 5.2.6 in package.json.

packages/artplayer/src/player/fullscreenMix.js

@@ -43,7 +43,7 @@ export default function fullscreenMix(art) {
   }
 
   const webkitScreenfull = (art) => {
-    art.proxy(document, 'webkitfullscreenchange', () => {
+    art.on('document:webkitfullscreenchange', () => {
       art.emit('fullscreen', art.fullscreen)
       art.emit('resize')
     })