RustFS rustfs-audit Complete Implementation with Enterprise Observability (#557)

* Initial plan

* Implement core audit system with multi-target fan-out and configuration management

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

* Changes before error encountered

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

* Complete audit system with comprehensive observability and test coverage

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

* improve code

* fix

* improve code

* fix test

* fix test

* fix

* add `rustfs-audit` to `rustfs`

* upgrade crate version

* fmt

* fmt

* fix

---------

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>

crates/config/src/constants/mod.rs

@@ -15,4 +15,5 @@
 pub(crate) mod app;
 pub(crate) mod console;
 pub(crate) mod env;
+pub(crate) mod targets;
 pub(crate) mod tls;

crates/config/src/constants/targets.rs

@@ -0,0 +1,34 @@
+//  Copyright 2024 RustFS Team
+//
+//  Licensed under the Apache License, Version 2.0 (the "License");
+//  you may not use this file except in compliance with the License.
+//  You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+//  Unless required by applicable law or agreed to in writing, software
+//  distributed under the License is distributed on an "AS IS" BASIS,
+//  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+//  See the License for the specific language governing permissions and
+//  limitations under the License.
+
+pub const WEBHOOK_ENDPOINT: &str = "endpoint";
+pub const WEBHOOK_AUTH_TOKEN: &str = "auth_token";
+pub const WEBHOOK_CLIENT_CERT: &str = "client_cert";
+pub const WEBHOOK_CLIENT_KEY: &str = "client_key";
+pub const WEBHOOK_BATCH_SIZE: &str = "batch_size";
+pub const WEBHOOK_QUEUE_LIMIT: &str = "queue_limit";
+pub const WEBHOOK_QUEUE_DIR: &str = "queue_dir";
+pub const WEBHOOK_MAX_RETRY: &str = "max_retry";
+pub const WEBHOOK_RETRY_INTERVAL: &str = "retry_interval";
+pub const WEBHOOK_HTTP_TIMEOUT: &str = "http_timeout";
+
+pub const MQTT_BROKER: &str = "broker";
+pub const MQTT_TOPIC: &str = "topic";
+pub const MQTT_QOS: &str = "qos";
+pub const MQTT_USERNAME: &str = "username";
+pub const MQTT_PASSWORD: &str = "password";
+pub const MQTT_RECONNECT_INTERVAL: &str = "reconnect_interval";
+pub const MQTT_KEEP_ALIVE_INTERVAL: &str = "keep_alive_interval";
+pub const MQTT_QUEUE_DIR: &str = "queue_dir";
+pub const MQTT_QUEUE_LIMIT: &str = "queue_limit";