[FLINK-27964][python] Support Cassandra connector in Python DataStream API

[pengmide]

What is the purpose of the change

Support Cassandra connector in Python DataStream API.

Brief change log

• Introduces policy methods in ClusterBuilder.

Verifying this change

• CassandraSinkTest could verify the ClusterBuilder in CassandraSink.

Does this pull request potentially affect one of the following parts:

• Dependencies (does it add or upgrade a dependency): (yes / no)
• The public API, i.e., is any changed class annotated with @Public(Evolving): (yes / no)
• The serializers: (yes / no / don't know)
• The runtime per-record code paths (performance sensitive): (yes / no / don't know)
• Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Kubernetes/Yarn, ZooKeeper: (yes / no / don't know)
• The S3 file system connector: (yes / no / don't know)

Documentation

• Does this pull request introduce a new feature? (yes / no)
• If yes, how is the feature documented? (not applicable / docs / JavaDocs / not documented)

[flinkbot]

CI report:

• ad6e6b0 Azure: FAILURE

Bot commands

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• @flinkbot run azure re-run the last Azure build

[dianfu]

Suggested change

	public static Cluster.Builder clusterBuilder;
	private final Cluster.Builder clusterBuilder;

[pengmide]

@dianfu The Cluster.Builder cannot be serialized, I have update the implementation in buildCluster method, PTAL~

[dianfu]

Add LoggingRetryPolicy?

[pengmide]

public LoggingRetryPolicy(RetryPolicy policy) method has interface parameters: policy that can not be serialized. Do you have a better idea?

[github-actions]

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[github-actions]

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