Support remote patches

[drubb]

For now, this tool only supports local patch files. Many Drupal projects specify remote patches hosted on d.o. Example:

"patches": {
            "drupal/diff": {
                "Back button for comparison page": "https://www.drupal.org/files/issues/back_button_for-2853193-4.patch"
            },
            "drupal/entity_browser": {
                "Provide inline entity form FieldWidgetDisplay": "https://www.drupal.org/files/issues/2019-07-04/2858438_17.patch",
                "Re-order + remove broken with the Entity Reference (and File) widget": "https://www.drupal.org/files/issues/2020-06-05/2851580-88.patch"
            },
            "drupal/password_policy": {
                "Policies should declare a config dependency on the plugin modules": "https://www.drupal.org/files/issues/2020-04-14/2918974-7-11.patch",
                "Importing configuration on site without password_policy activated": "https://www.drupal.org/files/issues/2020-03-20/password-policy-2771129-110.patch"
            },
            "drupal/field_group": {
                "Undefined property: stdClass::$region in field_group_form_process()": "https://www.drupal.org/files/issues/2020-06-15/3059614-37.patch"
            }
        }

Support for this should be added.