Dev: use Superglobals service and remove superglobals

[kenjis]

Use Services::superglobals() and remove all superglobals ($_SERVER, $_GET) in the code base (except in the Superglobals class).

https://github.com/codeigniter4/CodeIgniter4/blob/60b22bf6022f5979036a2fd309df6e3a00e89c05/system/Config/Services.php#L723

https://github.com/codeigniter4/CodeIgniter4/blob/60b22bf6022f5979036a2fd309df6e3a00e89c05/system/Superglobals.php#L19

[paulbalandan]

This is a good phpstan rule.