Function handle_config_reload_notification 

pub async fn handle_config_reload_notification<F, Fut>(
    config: &ConfigReloadWorkerConfig,
    message: ConfigReloadMessage,
    reload: F,
) -> Result<ConfigReloadDecision>
where
    F: FnOnce(ConfigReloadMessage) -> Fut,
    Fut: Future<Output = Result<()>>,

Handles one reload notification by filtering namespace/origin and invoking reload.