Update a setting for the given infusion or create it if the setting does not exist.
set_setting( string $setting_name, string $setting_value, string $setting_inf ) : bool
$setting_name (string) (Required) The name of the setting, must be unique for each infusion.
$setting_value (string) (Required) The value of the setting.
$setting_inf (string) (Required) The infusion name this setting belongs to.
(bool) Returns true on successful update / insert or false on error.
set_setting('allow_upload', 1, 'my_infusion');