[python-client] Support KeySharedPolicy in consumer configuration

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.

從 Python 用戶端的 consumer 設定開始，找到 ConsumerConfiguration::KeySharedPolicy 介面，然後比較 C++、Java 和 Go 用戶端中所連結的相關實作。完成標準是 Python 用戶端以與這些用戶端一致的方式提供 KeySharedPolicy 及其相關的 setter 和 getter。

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