Add pdo constants

[jawira]

    /**
     * pdo.dsn.*
     *
     * - Default:  
     * - Changeable:  only
     * - Changelog: Available since PHP 5.1.0.
     *
     * @see        https://www.php.net/manual/en/pdo.configuration.php#ini.pdo.dsn
     * @deprecated This configuration setting cannot be set at Runtime
     */
    const PDO_DSN_* = 'pdo.dsn.*';