Admin java sdk can't use BrokerStats.getLoadReport method

**Describe the bug**

Admin java sdk can't use BrokerStats.getLoadReport method . Below is environment

os: win 10
java: 1.8

maven

```

org.apache.pulsar
pulsar-client-admin
2.9.2

```

here is the code

```java
try( PulsarAdmin admin = PulsarAdmin.builder()
.serviceHttpUrl(url)
.build()) {

BrokerStats brokerStats = admin.brokerStats();

System.out.println(brokerStats.getLoadReportAsync().get());

} catch (Exception e) {
e.printStackTrace();
}
```

exception:

```
java.util.concurrent.ExecutionException: org.apache.pulsar.client.admin.PulsarAdminException: java.lang.TypeNotPresentException: Type org.apache.pulsar.shade.org.apache.pulsar.policies.data.loadbalancer.LoadManagerReport not present
at java.util.concurrent.CompletableFuture.reportGet(CompletableFuture.java:357)
at java.util.concurrent.CompletableFuture.get(CompletableFuture.java:1908)
at com.pulsar.service.impl.BrokerServiceImpl.main(BrokerServiceImpl.java:94)
Caused by: org.apache.pulsar.client.admin.PulsarAdminException: java.lang.TypeNotPresentException: Type org.apache.pulsar.shade.org.apache.pulsar.policies.data.loadbalancer.LoadManagerReport not present
at org.apache.pulsar.client.admin.internal.BaseResource.getApiException(BaseResource.java:247)
at org.apache.pulsar.client.admin.internal.BrokerStatsImpl$5.failed(BrokerStatsImpl.java:210)
at org.apache.pulsar.shade.org.glassfish.jersey.client.JerseyInvocation.submit(JerseyInvocation.java:908)
at org.apache.pulsar.shade.org.glassfish.jersey.client.JerseyInvocation.submit(JerseyInvocation.java:800)
at org.apache.pulsar.shade.org.glassfish.jersey.client.JerseyInvocation$AsyncInvoker.method(JerseyInvocation.java:614)
at org.apache.pulsar.shade.org.glassfish.jersey.client.CompletableFutureAsyncInvoker.get(CompletableFutureAsyncInvoker.java:30)
at org.apache.pulsar.shade.org.glassfish.jersey.client.CompletableFutureAsyncInvoker.get(CompletableFutureAsyncInvoker.java:26)
at org.apache.pulsar.client.admin.internal.BaseResource.asyncGetRequest(BaseResource.java:165)
at org.apache.pulsar.client.admin.internal.BrokerStatsImpl.getLoadReportAsync(BrokerStatsImpl.java:201)
... 1 more
Caused by: java.lang.TypeNotPresentException: Type org.apache.pulsar.shade.org.apache.pulsar.policies.data.loadbalancer.LoadManagerReport not present
at sun.reflect.generics.factory.CoreReflectionFactory.makeNamedType(CoreReflectionFactory.java:117)
at sun.reflect.generics.visitor.Reifier.visitClassTypeSignature(Reifier.java:125)
at sun.reflect.generics.tree.ClassTypeSignature.accept(ClassTypeSignature.java:49)
at sun.reflect.generics.visitor.Reifier.reifyTypeArguments(Reifier.java:68)
at sun.reflect.generics.visitor.Reifier.visitClassTypeSignature(Reifier.java:138)
at sun.reflect.generics.tree.ClassTypeSignature.accept(ClassTypeSignature.java:49)
at sun.reflect.generics.repository.ClassRepository.getSuperInterfaces(ClassRepository.java:108)
at java.lang.Class.getGenericInterfaces(Class.java:913)
at org.apache.pulsar.shade.org.glassfish.jersey.internal.util.ReflectionHelper.getClass(ReflectionHelper.java:1085)
at org.apache.pulsar.shade.org.glassfish.jersey.internal.util.ReflectionHelper.getClass(ReflectionHelper.java:1081)
at org.apache.pulsar.shade.org.glassfish.jersey.client.JerseyInvocation.submit(JerseyInvocation.java:823)
... 7 more
Caused by: java.lang.ClassNotFoundException: org.apache.pulsar.shade.org.apache.pulsar.policies.data.loadbalancer.LoadManagerReport
at java.net.URLClassLoader.findClass(URLClassLoader.java:382)
at java.lang.ClassLoader.loadClass(ClassLoader.java:418)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:355)
at java.lang.ClassLoader.loadClass(ClassLoader.java:351)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:348)
at sun.reflect.generics.factory.CoreReflectionFactory.makeNamedType(CoreReflectionFactory.java:114)
... 17 more

```

Start with BrokerStatsImpl.getLoadReportAsync and BaseResource in the 2.9.2 admin client, then inspect how the shaded LoadManagerReport type is packaged in the Maven dependency. Reproduce the supplied Java 8 example and trace the TypeNotPresentException; done means getLoadReportAsync().get() completes without the reported missing-class error.

Written by the indexing model from the issue text.