Support /tabpfn (v1) endpoints

[simo-prior]

Ticket here

Description
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[gemini-code-assist]

Summary of Changes

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This pull request implements new API endpoints for fitting and predicting with TabPFN models. It includes dependency updates, client refactoring for data serialization and deduplication, and introduces new data models for requests and responses.

Highlights

• API Endpoints: This PR introduces new API endpoints (/tabpfn) to support fitting and predicting with TabPFN models, aligning with the ticket to implement new fit and predict endpoints.
• Dependency Updates: The PR updates the project's dependencies, adding google-crc32c and pyarrow to ensure compatibility and support for new functionalities.
• Client Refactoring: The client has been refactored to use Parquet for data serialization and introduces dataset deduplication, enhancing efficiency and reducing redundancy.

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[safaricd]

LGTM - approving with two minor comments.