**Add webhook event publishing for music state changes**

Introduced webhook event publishing to push music-state updates to a configured endpoint. Implemented `WebhookDispatcher` and `NoopEventPublisher` for dispatching events asynchronously or disabling them when no URL is set. Added handling of events like track start/end, queue updates, volume changes, and voice connection changes, enhancing integration with external systems.

pom.xml

@@ -177,6 +177,7 @@
             <version>5.3.2</version>
         </dependency>
 
+
         <dependency>
             <groupId>io.javalin</groupId>
             <artifactId>javalin</artifactId>