feat: implement event notification system

- Add core event notification interfaces
- Support multiple notification backends:
  - Webhook (default)
  - Kafka
  - MQTT
  - HTTP Producer
- Implement configurable event filtering
- Add async event dispatching with backpressure handling
- Provide serialization/deserialization for event payloads

This module enables system events to be published to various endpoints
with consistent delivery guarantees and failure handling.

rustfs/Cargo.toml

@@ -60,7 +60,7 @@ s3s.workspace = true
 serde.workspace = true
 serde_json.workspace = true
 serde_urlencoded = { workspace = true }
-shadow-rs.workspace = true
+shadow-rs = { workspace = true, features = ["build"] }
 tracing.workspace = true
 time = { workspace = true, features = ["parsing", "formatting", "serde"] }
 tokio-util.workspace = true
@@ -103,5 +103,5 @@ hyper-util = { workspace = true, features = [
 ] }
 transform-stream = { workspace = true }
 netif = "0.1.6"
-shadow-rs.workspace = true
+shadow-rs = { workspace = true, features = ["build"] }
 # pin-utils = "0.1.0"

rustfs/src/config/mod.rs

@@ -103,6 +103,10 @@ pub struct Opt {
 
     #[arg(long, env = "RUSTFS_LICENSE")]
     pub license: Option<String>,
+
+    /// event notifier config file
+    #[arg(long, env = "RUSTFS_EVENT_CONFIG")]
+    pub event_config: Option<String>,
 }
 
 // lazy_static::lazy_static! {