message: Add new query node type RECURSIVE_CTE_NODE
diff: namespace duckdb {
  -enum QueryNodeType : uint8_t { SELECT_NODE = 1, SET_OPERATION_NODE = 2, BOUND_SUBQUERY_NODE = 3 };
  +enum QueryNodeType : uint8_t { SELECT_NODE = 1, SET_OPERATION_NODE = 2, BOUND_SUBQUERY_NODE = 3, RECURSIVE_CTE_NODE = 4 };
  //! Single node in ORDER BY statement
  struct OrderByNode {
  