Amend PDO driver-specific class names (#14069)

As suggested in https://externals.io/message/123166

Fix PdoSqlite::loadExtension() test (#13736)

The test contained a syntax error and an incorrect use of loadExtension(), which returns void not bool.

Also install the necessary packa

Fix PdoSqlite::loadExtension() test (#13736)

The test contained a syntax error and an incorrect use of loadExtension(), which returns void not bool.

Also install the necessary package in CI, so it gets tested there.

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Implement PDO driver-specific subclasses

RFC: https://wiki.php.net/rfc/pdo_driver_specific_subclasses
Closes GH-12804

Co-Authored-By: Danack <Danack@basereality.com>