Add logger configuration for Lavalink client

Introduced a dedicated logger `dev.arbjerg.lavalink` with `info` level and disabled additivity. Updated the log4j2 configuration to log Lavalink client activity to both console and rolling file appenders, ensuring better log separation and monitoring.

src/main/resources/log4j2.properties

@@ -42,6 +42,12 @@ logger.lavalink.additivity = false
 logger.lavalink.appenderRef.rolling.ref = LogToRollingFile
 logger.lavalink.appenderRef.console.ref = consoleLogger
 
+logger.lavalinkclient.name = dev.arbjerg.lavalink
+logger.lavalinkclient.level = info
+logger.lavalinkclient.additivity = false
+logger.lavalinkclient.appenderRef.rolling.ref = LogToRollingFile
+logger.lavalinkclient.appenderRef.console.ref = consoleLogger
+
 logger.app.name = me.bobert.netneutrality
 logger.app.level = debug
 logger.app.additivity = false