Moved commit "Enhanced parallelism of data restoring in ydb tools restore" from ydb repo

Author: pixcc

src/client/import/CMakeLists.txt

@@ -11,8 +11,10 @@ target_link_libraries(client-ydb_import PUBLIC
   client-ydb_types-operation
 )
 
-target_sources(client-ydb_import PRIVATE
-  import.cpp
+target_sources(client-ydb_import
+  PRIVATE
+    import.cpp
+    out.cpp
 )
 
 generate_enum_serilization(client-ydb_import

src/client/import/out.cpp

@@ -0,0 +1,5 @@
+#include <ydb-cpp-sdk/client/import/import.h>
+
+Y_DECLARE_OUT_SPEC(, NYdb::NImport::TImportDataResult, o, x) {
+    return x.Out(o);
+}