Do not generate frameless info items when func info generation is disabled

While here, I fixed newlines around arginfo and function entry generation. Previously, newlines were repeated.

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>

Expose PDO_ODBC_TYPE to userland