Allow CTEs in read-only queries.
Common Table Expressions in PostgreSQL allow a different way to define derived tables. Here's an example from the pg docs: WITH regional_sales AS ( SELECT region, SUM(amount) AS total_sales FROM orders GROUP BY region ), top_regions AS ( SELECT region FROM regional_sales WHERE total_sales > (SELECT SUM(total_sales)/10 FROM regional_sales) ) SELECT region, product, SUM(quantity) AS product_units, SUM(amount) AS product_sales FROM orders WHERE region IN (SELECT region FROM top_regions) GROUP BY region, product; https://www.postgresql.org/docs/current/queries-with.html This commit adds the :with keyword to the set of keywords allowed to begin a query against a `prevent_writes` PostgreSQL connection. Thx to @kamipo, this also adds the same support for sqlite3 and mysql2 https://www.sqlite.org/lang_with.html https://dev.mysql.com/doc/refman/8.0/en/with.html
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