Add configurable timeout and SSL options for connections

[aortizsm]

Hi. I'm experiencing file_get_contents(): SSL: Connection reset by peer errors when connecting to Moodle servers with strict SSL configurations.

Problem:

• No way to configure connection timeouts
• Limited SSL options control when using file_get_contents()
• Connections fail with enterprise SSL certificates

`$moodle = new MoodleRest('https://miuniversidad.edu/moodle/webservice/rest/server.php', 'my_token');

// error: "SSL: Connection reset by peer" in production

$users = $moodle->request('core_enrol_get_enrolled_users', ['courseid' => 12345]);`