feat: add artplayer-plugin-audio-track for audio synchronization with video

- Implemented the audio track plugin for ArtPlayer, allowing audio to be synchronized with video playback.
- Added main functionality in `src/index.js` to handle audio playback, synchronization, and event listeners for play, pause, seek, and volume changes.
- Created TypeScript definitions for the plugin in `types/artplayer-plugin-audio-track.d.ts`.
- Included necessary build files in `dist/` for various module formats (CommonJS, ES Module, and legacy).
- Updated package metadata in `package.json` and added a README for documentation.
- Added `.npmignore` to exclude unnecessary files from the package.

packages/artplayer-plugin-audio-track/README.md

@@ -0,0 +1,11 @@
+# artplayer-plugin-audio-track
+
+audio-track plugin for ArtPlayer
+
+## Demo
+
+[https://artplayer.org](https://artplayer.org/?libs=./uncompiled/artplayer-plugin-audio-track/index.js&example=audio-track)
+
+## License
+
+MIT © Harvey Zack