change grpc api calls order

Author: eivanov89

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

@@ -59,13 +59,13 @@ public CompletableFuture<Status> start(Observer<RespT> observer) {
         synchronized (call) {
             try {
                 call.start(this, headers);
-                call.request(1);
                 if (logger.isTraceEnabled()) {
                     logger.trace("ReadStreamCall[{}] --> {}", traceId, TextFormat.shortDebugString((Message) request));
                 }
                 call.sendMessage(request);
                 // close stream by client side
                 call.halfClose();
+                call.request(1);
             } catch (Throwable t) {
                 try {
                     call.cancel(null, t);

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

@@ -50,12 +50,12 @@ public UnaryCall(String traceId, ClientCall<ReqT, RespT> call, GrpcStatusHandler
     public CompletableFuture<Result<RespT>> startCall(ReqT request, Metadata headers) {
         try {
             call.start(this, headers);
-            call.request(1);
             if (logger.isTraceEnabled()) {
                 logger.trace("UnaryCall[{}] --> {}", traceId, TextFormat.shortDebugString((Message) request));
             }
             call.sendMessage(request);
             call.halfClose();
+            call.request(1);
         } catch (Exception ex) {
             future.completeExceptionally(ex);
             try {