[9.x] Http client - allow to provide closure as "throwif" condition

[gdebrauwer]

Currently, the throwIf method on the Http PendingRequest/Response only allows a boolean. This means you can not let it behave differently based on what the failed response actually is. To make this possible, this PR adds the option to provide a closure which will be executed with the $response as an argument. This allows you to inspect the response before determining if you want to throw an exception or not.

Http::throwIf(fn ($response) => $response->status() !== 404)->get('https://laravel.com/foo');

Http::get('https://laravel.com/foo')->throwIf(fn ($response) => $response->status() !== 404);

[gdebrauwer]

failed test not related to these PR changes