Add default constructor in ydb-cli:: TClientCommand (#19927)

Author: flown4qqqq

ydb/public/lib/ydb_cli/common/command.h

@@ -23,6 +23,8 @@ struct TCommandFlags {
 };
 
 class TClientCommand {
+protected:
+    TClientCommand() = default;
 public:
     static bool TIME_REQUESTS; // measure time of requests
     static bool PROGRESS_REQUESTS; // display progress of long requests