[BUG] Judgment criteria for reconnecting the producer

[wenbingshen]

Describe the bug
Related to this issue apache/pulsar-client-go#676

#11804, this PR rewrites the equals method of the Producer, resulting in that when different pulsar-client-go uses different port to reconnect, the old producer cannot be removed because the remoteAddress will be verified by equals:

if (producers.remove(producer.getProducerName(), producer)) {

#12846, this pr removes equals and will use hashcode for judgment. At this time, the
old producer cannot be removed.

The server does not allow different ports to connect to the same producerName. Does it assume that the previous connection will be disconnected first, and the new connection will be established? But the current pulsar-client-go seems to have some problems that the old connection did not handle.

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