PostgreSQL: Add support for TABLE query command

[BenSatori]

Adds support for PostgreSQL's TABLE query command, which is syntactic sugar for selecting all rows from a table.

Examples that now parse:

TABLE customers ORDER BY contact_name LIMIT 1;
TABLE ONLY customers;
TABLE customers *;

This also supports TABLE in query-expression positions, such as subqueries, through the existing query body parser.

PostgreSQL docs: https://www.postgresql.org/docs/current/sql-select.html

AI assistance was used in preparing this change.