Is your feature request related to a problem? Please describe.

Pulsar supports unload a non-partitioned-topic or a partition of a partitioned topic. If there has a partitioned topic with too many partitions, users need to get all partition and unload them one by one. We need to support unload all partition of a partitioned topic.

Describe the solution you'd like

Support unload all partition of a partitioned topic.

The implementation is similar to this:

We need to get all partition of a partitioned topic if the topic is a partitioned topic and send unload requests and waiting for them back.

Additional context

We need to add an integration test or unit test for verifying this change.

There has a similar unit test about REST API: