[python] Add build changeset to distinfo METADATA in pip packages

[derek-gerstmann]

Description

For provenance purposes, it would be nice to include the exact changeset that the python packages were built from in the METADATA for the distinfo.

Reproducing case

Changeset should be included in the distinfo for python package.

How did you get Halide?

pip (halide)

Halide version

No response

Halide commit (if known)

No response

Target

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Operating system

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Additional context

No response