[FLINK-34469][table] Implement TableDistribution toString

[jeyhunkarimov]

What is the purpose of the change

Implement TableDistribution toString

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

• Dependencies (does it add or upgrade a dependency): (no)
• The public API, i.e., is any changed class annotated with @Public(Evolving): ( no)
• The serializers: (no)
• The runtime per-record code paths (performance sensitive): (no)
• Anything that affects deployment or recovery: JobManager (and its components), Checkpointing, Kubernetes/Yarn, ZooKeeper: (no)
• The S3 file system connector: (no)

Documentation

• Does this pull request introduce a new feature? (no)

[flinkbot]

CI report:

• fcdae35 Azure: SUCCESS

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[JingGe]

Thanks @jeyhunkarimov! Just left one comment, PTAL.

[JingGe]

1. If this is the requirement of the toString() method. We should consider marking the asSerializableString() as private and replace any external call of asSerializableString() with toString().
2. Could you also add a test for it?

[jeyhunkarimov]

Done. But IMO asSerializableString() should be public as it is everywhere in the codebase.

[JingGe]

LGTM