Support logging exception messages in UTF-16 because some libs may us…

…e UTF-16 encoding

turms-server-common/src/main/java/im/turms/server/common/infra/logging/core/layout/TemplateLayout.java

@@ -69,7 +69,7 @@ private void appendException(Throwable e, ByteBuf buffer, int indent, int depth)
         String message = e.getMessage();
         if (message != null) {
             buffer.writeBytes(COLON)
-                    .writeBytes(StringUtil.getBytes(message));
+                    .writeBytes(StringUtil.getUtf8Bytes(message));
         }
 
         StackTraceElement[] stacks = e.getStackTrace();