Fix memory leak of AudioSource (#486)

* add close method to track

* fix example as well

* Create selfish-moons-tie.md

Author: typester

.changeset/selfish-moons-tie.md

@@ -0,0 +1,6 @@
+---
+"example-publish-wav": patch
+"@livekit/rtc-node": patch
+---
+
+Fix memory leak of AudioSource

examples/publish-wav/index.ts

@@ -64,6 +64,7 @@ while (written < dataSize) {
 }
 await source.waitForPlayout();
 // release resources allocated for audio publishing
+await track.close();
 await source.close();
 
 await room.disconnect();

packages/livekit-rtc/src/track.ts

@@ -45,6 +45,10 @@ export abstract class Track {
   get muted(): boolean | undefined {
     return this.info?.muted;
   }
+
+  async close() {
+    this.ffi_handle.dispose();
+  }
 }
 
 export class LocalAudioTrack extends Track {