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.

docs/index.html

@@ -120,6 +120,10 @@
                             <a
                                 href="/?libs=./uncompiled/artplayer-plugin-liquid-glass/index.js&example=liquid.glass">artplayer-plugin-liquid-glass</a>
                         </li>
+                        <li>
+                            <a
+                                href="/?libs=./uncompiled/artplayer-plugin-audio-track/index.js&example=audio.track">artplayer-plugin-audio-track</a>
+                        </li>
                     </ul>
                     <ul>
                         <li class="title">Proxys</li>