Fix KMS configuration synchronization across cluster nodes (#855)

* Initial plan

* Add KMS configuration persistence to cluster storage

Co-authored-by: houseme <4829346+houseme@users.noreply.github.com>

* Apply code formatting to KMS configuration changes

Co-authored-by: houseme <4829346+houseme@users.noreply.github.com>

* add comment

* fix fmt

* fix

* Fix overlapping dependabot cargo configurations

Co-authored-by: houseme <4829346+houseme@users.noreply.github.com>

* improve code for comment and replace  `Once_Cell` to `std::sync::OnceLock`

---------

Co-authored-by: copilot-swe-agent[bot] <198982749+Copilot@users.noreply.github.com>
Co-authored-by: houseme <4829346+houseme@users.noreply.github.com>
Co-authored-by: houseme <housemecn@gmail.com>
Co-authored-by: loverustfs <155562731+loverustfs@users.noreply.github.com>

crates/targets/src/check.rs

@@ -13,6 +13,7 @@
 // limitations under the License.
 
 /// Check if MQTT Broker is available
+///
 /// # Arguments
 /// * `broker_url` - URL of MQTT Broker, for example `mqtt://localhost:1883`
 /// * `topic` - Topic for testing connections
@@ -40,6 +41,7 @@
 /// url = "2.5.7"
 /// tokio = { version = "1", features = ["full"] }
 /// ```
+///
 pub async fn check_mqtt_broker_available(broker_url: &str, topic: &str) -> Result<(), String> {
     use rumqttc::{AsyncClient, MqttOptions, QoS};
     let url = rustfs_utils::parse_url(broker_url).map_err(|e| format!("Broker URL parsing failed:{e}"))?;