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.

crates/event-notifier/src/notifier.rs

@@ -1,47 +0,0 @@
-// src/notifier.rs
-use crate::error::Error;
-use crate::event::Event;
-use crate::rules::{RulesMap, TargetIDSet};
-use crate::target::TargetList;
-use std::collections::HashMap;
-use std::sync::{Arc, RwLock};
-use tokio::sync::broadcast;
-
-pub struct EventNotifier {
-    target_list: Arc<TargetList>,
-    rules: RwLock<HashMap<String, RulesMap>>,
-    tx: broadcast::Sender<Event>,
-}
-
-impl EventNotifier {
-    pub fn new(capacity: usize) -> Self {
-        let (tx, _) = broadcast::channel(capacity);
-        Self {
-            target_list: Arc::new(TargetList::new()),
-            rules: RwLock::new(HashMap::new()),
-            tx,
-        }
-    }
-
-    pub async fn send(&self, event: Event) -> Result<(), Error> {
-        let rules = self
-            .rules
-            .read()
-            .map_err(|_| Error::StoreError("Failed to read rules".to_string()))?;
-        // 检查规则匹配
-        let target_ids = if let Some(rules_map) = rules.get(&event.s3.bucket.name) {
-            rules_map.match_targets(event.s3.event_name, &event.s3.object.key)
-        } else {
-            TargetIDSet::new()
-        };
-
-        // 发送事件
-        if !target_ids.is_empty() {
-            self.target_list.send(event.clone(), &target_ids).await;
-        }
-
-        // 广播给监听者
-        let _ = self.tx.send(event);
-        Ok(())
-    }
-}