[A] Add function ft_row_count

src/fort.hpp

@@ -1069,6 +1069,18 @@ public:
         return ft_is_empty(table_);
     }
 
+    /**
+     * Get number of rows in the table.
+     *
+     * @return
+     *   Number of rows in the table.
+     */
+    std::size_t
+    row_count() const noexcept
+    {
+        return ft_row_count(table_);
+    }
+
     /**
      * Get current cell.
      *