refactor: Update video element in Artplayer to support custom canvas or video

packages/artplayer-proxy-webav/src/index.js

@@ -0,0 +1,9 @@
+export default function artplayerProxyWebAV(option) {
+    return (art) => {
+        return document.createElement('video');
+    };
+}
+
+if (typeof window !== 'undefined') {
+    window['artplayerProxyWebAV'] = artplayerProxyWebAV;
+}