refactor(logger): remove LoggerUtil and add simplelogger for tests

wrapper/javacord/build.gradle.kts

@@ -16,6 +16,8 @@ dependencies {
     testImplementation(libs.mockito)
 
     testRuntimeOnly("org.junit.platform:junit-platform-launcher")
+    testImplementation(libs.slf4j.simple)
+
     implementation(libs.slf4j)
     implementation(libs.javacord)
     implementation(libs.geantyref)

wrapper/javacord/src/test/resources/simplelogger.properties

@@ -0,0 +1,7 @@
+# SLF4J's SimpleLogger configuration file
+# Simple implementation of Logger that sends all enabled log messages, for all defined loggers, to System.err.
+
+# Default logging detail level for all instances of SimpleLogger.
+# Must be one of ("trace", "debug", "info", "warn", or "error").
+# If not specified, defaults to "info".
+org.slf4j.simpleLogger.defaultLogLevel=trace