Added lost tracing

Author: alex268

core/src/main/java/tech/ydb/core/impl/call/ReadWriteStreamCall.java

@@ -88,6 +88,10 @@ public CompletableFuture<Status> start(Observer<R> observer) {
     public void sendNext(W message) {
         synchronized (call) {
             if (flush()) {
+                if (logger.isTraceEnabled()) {
+                    String msg = TextFormat.shortDebugString((Message) message);
+                    logger.trace("ReadWriteStreamCall[{}] --> {}", traceId, msg);
+                }
                 call.sendMessage(message);
             } else {
                 messagesQueue.add(message);
@@ -103,7 +107,8 @@ private boolean flush() {
             }
 
             if (logger.isTraceEnabled()) {
-                logger.trace("ReadWriteStreamCall[{}] --> {}", traceId, TextFormat.shortDebugString((Message) next));
+                String msg = TextFormat.shortDebugString((Message) next);
+                logger.trace("ReadWriteStreamCall[{}] --> {}", traceId, msg);
             }
             call.sendMessage(next);
         }