feat: Add optional description parameter when creating dataset version via Python SDK

[sahusiddharth]

Enhancements

Resolves: #8384

This enhancement introduces support for adding a version description when:

• Creating a new dataset version
• Adding new examples to an existing dataset

This is now available via the Python SDK.

Example Usage

px_client.datasets.add_examples_to_dataset(
    dataset="dataset name",
    inputs=[...],
    outputs=[...],
    dataset_version_description="version description",
)

Minimal Implementation

Use this Colab notebook

Result Preview

Below is a screenshot of the dataset version UI after executing the example above:

---

Note

Adds an optional version description when appending examples via Python SDK (sync/async) and persists it in dataset versions server-side.

• Python SDK (client):
  • Datasets.add_examples_to_dataset(...): new dataset_version_description param; forwarded as dataset_description to both _upload_tabular_dataset and _upload_json_dataset.
  • AsyncDatasets.add_examples_to_dataset(...): same addition and forwarding.
• Server/DB:
  • add_dataset_examples(...): pass description to insert_dataset_version(...) so new versions store the description.

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[sahusiddharth]

Hi @axiomofjoy and @anticorrelator,

At your convenience, please review this PR and let me know if any revisions are necessary.