[Docs] Add documentation for Python Client

[leekeiabstraction]

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• I searched in the issues and found nothing similar.

Description

We should have documentation for Python client similar to what we have for Java client

https://fluss.apache.org/docs/apis/java-client/

Willingness to contribute

• I'm willing to submit a PR!

[Prajwal-banakar]

Hi @leekeiabstraction I would like to work on this. I'm familiar with the Java client and will draft the Python documentation to match its structure.

[leekeiabstraction]

Great to hear that @Prajwal-banakar , @polyzos do you mind assigning the task to Prajwal? Thank you!