docs: add datasets tutorial

[mostlyken]

Pull Request

Changes

Add a tutorial explaining how to create and access datasets using the SDK.

Why this change?

Tutorial for new SDK endpoints

Testing

Ran the notebook locally.

Additional Notes

N/A

---

Note

Adds a new “Creating and Using Datasets” tutorial, links it from the tutorials index, and includes the accompanying notebook and mock CSV data.

• Docs/Tutorials:
  • New tutorial entry in docs/tutorials.md: "Creating and Using Datasets" with Colab and notebook links.
  • Notebook: docs/tutorials/using-datasets/creating-and-using-datasets.ipynb
    • Demonstrates creating Datasets via SDK: description-only, from local files (with Markdown descriptions and file upload), and via Connectors; plus retrieving/downloading files.
  • Sample data: Adds docs/tutorials/using-datasets/data/mock_user_data.csv for the file-based dataset example.

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