[Bug] Alerting with triggers

### Search before asking

- [X] I searched in the [issues](https://github.com/apache/iotdb/issues) and found nothing similar.

### Version

- IoTDB Verions: 1.2.2 (Build: 5d0bfb0)
- Java Version: java 21.0.2 2024-01-16 LTS

### Describe the bug and provide the minimal reproduce step

# I got some error while trying to add a trigger with quite litterally the documentation provided example:
## ClusterAlertingExample.java File
```java
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.
*/

package org.apache.iotdb.trigger;

import org.apache.iotdb.db.engine.trigger.sink.alertmanager.AlertManagerConfiguration;
import org.apache.iotdb.db.engine.trigger.sink.alertmanager.AlertManagerEvent;
import org.apache.iotdb.db.engine.trigger.sink.alertmanager.AlertManagerHandler;
import org.apache.iotdb.trigger.api.Trigger;
import org.apache.iotdb.trigger.api.TriggerAttributes;
import org.apache.iotdb.tsfile.file.metadata.enums.TSDataType;
import org.apache.iotdb.tsfile.write.record.Tablet;
import org.apache.iotdb.tsfile.write.schema.MeasurementSchema;

import java.io.IOException;
import java.util.HashMap;
import java.util.List;

public class ClusterAlertingExample implements Trigger {

private final AlertManagerHandler alertManagerHandler = new AlertManagerHandler();

private final AlertManagerConfiguration alertManagerConfiguration =
new AlertManagerConfiguration("http://127.0.0.1:9093/api/v2/alerts");

private String alertname;

private final HashMap labels = new HashMap<>();

private final HashMap annotations = new HashMap<>();

@Override
public void onCreate(TriggerAttributes attributes) throws Exception {
alertname = "alert_test";

labels.put("series", "root.Firewall");
labels.put("value", "");
labels.put("severity", "");

annotations.put("summary", "high temperature");
annotations.put("description", "{{.alertname}}: {{.series}} is {{.value}}");

alertManagerHandler.open(alertManagerConfiguration);
}

@Override
public void onDrop() throws IOException {
alertManagerHandler.close();
}

@Override
public boolean fire(Tablet tablet) throws Exception {
List measurementSchemaList = tablet.getSchemas();
for (int i = 0, n = measurementSchemaList.size(); i < n; i++) {
if (measurementSchemaList.get(i).getType().equals(TSDataType.DOUBLE)) {
// for example, we only deal with the columns of Double type
double[] values = (double[]) tablet.values[i];
for (double value : values) {
if (value > 100.0) {
labels.put("value", String.valueOf(value));
labels.put("severity", "critical");
AlertManagerEvent alertManagerEvent =
new AlertManagerEvent(alertname, labels, annotations);
alertManagerHandler.onEvent(alertManagerEvent);
} else if (value > 50.0) {
labels.put("value", String.valueOf(value));
labels.put("severity", "warning");
AlertManagerEvent alertManagerEvent =
new AlertManagerEvent(alertname, labels, annotations);
alertManagerHandler.onEvent(alertManagerEvent);
}
}
}
}
return true;
}
}
```
## pom.xml File
```xml

4.0.0

apache.iotdb
cluster_alerting
1.0-SNAPSHOT

cluster_alerting

http://www.example.com

UTF-8
1.7
1.7

maven-clean-plugin
3.1.0



maven-resources-plugin
3.0.2


maven-compiler-plugin
3.8.0


maven-surefire-plugin
2.22.1


maven-jar-plugin
3.0.2


maven-install-plugin
2.5.2


maven-deploy-plugin
2.8.2



maven-site-plugin
3.7.1


maven-project-info-reports-plugin
3.0.0

org.apache.iotdb
iotdb-server
1.2.0

```

# The schema file is like this
i'm missing something?
```plaintext
cluster_alerting
├── src/main/java/org/apache/iotdb/trigger/
│ └── ClusterAlertingExample.java
└── pom.xml
```

################################################################################################
- I have builded the jar file using `mvn compile` -> `mvn package` command
- Then using the `jar tvf` command i got this output:

```plaintext
93 Thu Feb 22 09:48:48 UTC 2024 META-INF/MANIFEST.MF
0 Thu Feb 22 09:48:48 UTC 2024 META-INF/
0 Thu Feb 22 09:47:38 UTC 2024 org/
0 Thu Feb 22 09:47:38 UTC 2024 org/apache/
0 Thu Feb 22 09:47:38 UTC 2024 org/apache/iotdb/
0 Thu Feb 22 09:47:40 UTC 2024 org/apache/iotdb/trigger/
0 Thu Feb 22 09:48:48 UTC 2024 META-INF/maven/
0 Thu Feb 22 09:48:48 UTC 2024 META-INF/maven/apache.iotdb/
0 Thu Feb 22 09:48:48 UTC 2024 META-INF/maven/apache.iotdb/cluster_alerting/
3835 Thu Feb 22 09:48:40 UTC 2024 org/apache/iotdb/trigger/ClusterAlertingExample.class
2905 Thu Feb 22 09:47:34 UTC 2024 META-INF/maven/apache.iotdb/cluster_alerting/pom.xml
101 Thu Feb 22 09:48:48 UTC 2024 META-INF/maven/apache.iotdb/cluster_alerting/pom.properties
```

## As you can see i have a java class called `org/apache/iotdb/trigger/ClusterAlertingExample.class`
### but on IoTDB while i try to create the trigger i got this error:

```bash
IoTDB> CREATE STATELESS TRIGGER test
> BEFORE INSERT
> ON root.Firewall.**
> AS 'org.apache.iotdb.trigger.ClusterAlertingExample'
> USING URI 'file:///home/sean/apache-iotdb/ext/trigger/install/cluster_alerting-1.0-SNAPSHOT.jar'
Msg: 1303: Failed to load class 'org.apache.iotdb.trigger.ClusterAlertingExample', because it's not found in jar file: file:///home/sean/apache-iotdb/ext/trigger/install/cluster_alerting-1.0-SNAPSHOT.jar

```

### What did you expect to see?

### I'll expect to see a succesfully statement while execute the CREATE STATELESS TRIGGER function
```bash
IoTDB> CREATE STATELESS TRIGGER test
> BEFORE INSERT
> ON root.Firewall.**
> AS 'org.apache.iotdb.trigger.ClusterAlertingExample'
> USING URI 'file:///home/sean/apache-iotdb/ext/trigger/install/cluster_alerting-1.0-SNAPSHOT.jar'
Msg: The statement is executed successfully.
```

### What did you see instead?

### I got an error statement while execute the CREATE STATELESS TRIGGER function saying that the class is missing in the jar file
```bash
IoTDB> CREATE STATELESS TRIGGER test
> BEFORE INSERT
> ON root.Firewall.**
> AS 'org.apache.iotdb.trigger.ClusterAlertingExample'
> USING URI 'file:///home/sean/apache-iotdb/ext/trigger/install/cluster_alerting-1.0-SNAPSHOT.jar'
Msg: 1303: Failed to load class 'org.apache.iotdb.trigger.ClusterAlertingExample', because it's not found in jar file: file:///home/sean/apache-iotdb/ext/trigger/install/cluster_alerting-1.0-SNAPSHOT.jar
```

### Anything else?

_No response_

### Are you willing to submit a PR?

- [ ] I'm willing to submit a PR!

Start with the CREATE STATELESS TRIGGER command and the jar listing for ClusterAlertingExample.java, then compare the example's pom.xml dependency version with IoTDB 1.2.2. Reproduce the class-loading error using the supplied URI and verify whether the trigger class can be loaded; done means the documented alerting example creates successfully or the required correction is documented.

Written by the indexing model from the issue text.