Incorrect configuration of PartititionsUpdateInterval

[RobertIndie]

In https://github.com/apache/pulsar/pull/6732, we have implemented the auto update partitions feature for the c++ client. But the configuration of PartititionsUpdateInterval should be added to the ProducerConfiguration instead of the ClientConfiguration. This result users cannot set the PartititionsUpdateInterval for the specific producer.

Maybe we should deprecate the PartititionsUpdateInterval in the ClientConfiguration and add it to the ProducerConfiguration.