Expand `TABLE` command support

#704 added support for the `CREATE TABLE x AS TABLE y` by adding basic support for the `TABLE` command within the context of a `CREATE` statement. However, as noted in the [Postgres docs](https://www.postgresql.org/docs/current/sql-select.html#SQL-TABLE):

"It can be used as a top-level command or as a space-saving syntax variant in parts of complex queries. Only the WITH, UNION, INTERSECT, EXCEPT, ORDER BY, LIMIT, OFFSET, FETCH and FOR locking clauses can be used with TABLE; the WHERE clause and any form of aggregation cannot be used."

These other cases have yet to be investigated.

Revisa el soporte existente para TABLE introducido por #704 junto con la documentación de TABLE de PostgreSQL. Identifica qué casos de nivel superior y de cláusulas permitidas siguen sin estar soportados; se considera terminado cuando los casos previstos se analizan de forma coherente y están cubiertos por las pruebas del repositorio.

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