[python-client] Support KeySharedPolicy in consumer configuration

[amadav]

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Support for auto-hash and sticky-hash based policy (https://github.com/apache/pulsar/issues/4077) was added to cpp client (https://github.com/apache/pulsar/pull/7842) java (https://github.com/apache/pulsar/pull/5928) & go (https://github.com/apache/pulsar-client-go/pull/363) It would be great to have these changes ported to python client as well.

Describe the solution you'd like Expose the ConsumerConfiguration::KeySharedPolicy and related setter/getter to Python client.

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[zbentley]

This feature would be very useful for numerous use cases of ours.