Apache Camel multicast does not have Hub cloned

### Integration

sentry

### Java Version

8

### Version

6.6.0

### Steps to Reproduce

Create Apache Camel sample where multicast is used like:

```Java
package io.sentry.samples.spring.boot;

import java.util.UUID;
import org.apache.camel.CamelContext;
import org.apache.camel.Exchange;
import org.apache.camel.Processor;
import org.apache.camel.builder.RouteBuilder;
import org.apache.camel.impl.DefaultCamelContext;
import org.apache.camel.model.rest.RestBindingMode;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Component;

@Component
class RestApi extends RouteBuilder {

@Autowired PersonService personService;

@Override
public void configure() {
CamelContext context = new DefaultCamelContext();

restConfiguration()
.contextPath("/camel")
.port(8080)
.enableCORS(true)
.apiContextPath("/api-doc")
.apiProperty("api.title", "Test REST API")
.apiProperty("api.version", "v1")
.apiContextRouteId("doc-api")
.component("servlet")
.bindingMode(RestBindingMode.json);

rest("/api/")
.id("api-route")
.consumes("application/json")
.post("/bean")
.bindingMode(RestBindingMode.json_xml)
.type(MyBean.class)
.to("direct:remoteService");

rest("/api/")
.id("api-route")
.consumes("application/json")
.post("/bean2")
.bindingMode(RestBindingMode.json_xml)
.type(MyBean.class)
.to("direct:insert");

from("direct:remoteService")
.routeId("direct-route")
.tracing()
.multicast()
.parallelProcessing()
.to("direct:insert", "direct:insert2")
.log(">>> ${body.id}")
.log(">>> ${body.name}")
.transform()
.simple("Hello ${in.body.name}")
.setHeader(Exchange.HTTP_RESPONSE_CODE, constant(200));

from("direct:insert")
.process(
new Processor() {
public void process(Exchange xchg) throws Exception {
// Take the Employee object from the exchange and create the insert query
MyBean employee = xchg.getIn().getBody(MyBean.class);
String query =
"INSERT INTO person(id,firstName, lastName)values('"
+ employee.getId()
+ "','"
+ employee.getName()
+ "','"
+ UUID.randomUUID().toString()
+ "')";
// Set the insert query in body and call camel jdbc
xchg.getIn().setBody(query);
}
})
.to("jdbc:dataSource");

from("direct:insert2")
.process(
new Processor() {
public void process(Exchange xchg) throws Exception {
// Take the Employee object from the exchange and create the insert query
MyBean employee = xchg.getIn().getBody(MyBean.class);
String query =
"INSERT INTO person(id,firstName, lastName)values('9999"
+ employee.getId()
+ "','"
+ employee.getName()
+ "2','"
+ UUID.randomUUID().toString()
+ "')";
// Set the insert query in body and call camel jdbc
xchg.getIn().setBody(query);
}
})
.to("jdbc:dataSource");
}
}
```

Then e.g. check `SentryJdbcEventListener` using a debugger. It's run on a separate thread and has a separate Hub instance and therefore can't find the parent Span using `hub.getSpan()`.

### Expected Result

Hub is somehow cloned or passed to multicasted camel things (whatever the correct term here is) and Spans can be added to the parent span of the multicast.

### Actual Result

Hub is not cloned therefore parent Span can't be found.

### Ideas

We'd need some way of cloning the Hub onto the thread executing each of the multicasted parts. Maybe there's some sort of context in Apache Camel we can use.

從 Apache Camel multicast 路由和 SentryJdbcEventListener 開始，使用提供的範例重現在線程分離的情況下執行。檢查每個 multicast 部分中 hub.getSpan() 的解析方式，以及 Apache Camel 是否提供可用的 context；當子操作能夠找到並附加到父 span 時，即視為完成。

由索引模型根據 Issue 內容生成。