add support for `WITH ORDINALITY`

The following is valid sql, and works in postgres, but cannot be parsed with sqlparser:

```sql
select * from my_srf() with ordinality;
```

https://www.postgresql.org/docs/current/functions-srf.html

Initially reported in https://github.com/lovasoa/SQLpage/discussions/491#discussioncomment-9986790