feat: support ml_dtypes<0.5

[oraluben]

As title, currently it failed with ml_dtypes==0.4.x: tile-ai/tilelang#1108 (comment)

[gemini-code-assist]

Summary of Changes

Hello @oraluben, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request improves the robustness of the tvm_ffi's Cython bindings by enhancing its compatibility with different versions of the ml_dtypes library. It refactors the data type mapping mechanism to dynamically adapt to the presence or absence of certain data types, specifically those introduced in ml_dtypes version 0.5.0 and later. This modification prevents crashes and ensures the system can operate smoothly with a wider range of ml_dtypes installations.

Highlights

• Conditional ml_dtypes Mapping: The pull request introduces conditional logic to map specific ml_dtypes types (such as int2, uint2, and various float8 and float6 types) to DLDataType only if these types are present in the ml_dtypes library.
• Backward Compatibility: This change ensures backward compatibility with ml_dtypes versions older than 0.5.0, preventing runtime errors that would occur if the code attempted to access types not available in those older versions.

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[gemini-code-assist]

Code Review

The pull request introduces support for ml_types<0.5 by adding a conditional check for the existence of int2 attribute in the ml_dtypes module. Based on the presence of this attribute, the code maps additional data types from the ml_dtypes module to their corresponding DLDataType representations. This ensures compatibility with older versions of the ml_dtypes library.

[oraluben]

fyi: this works for ml_dtypes > 0.1