cuda.core: add tests for ObjectCode.from_library

[lijinf2]

Description

closes #663.

Adds tests for ObjectCode.from_library and extends the saxpy test-binary infrastructure from #2193.

• build_test_binaries.sh: package saxpy.o into saxpy.a for Linux / saxpy.lib for Windows via nvcc -lib
• CI (build-wheel.yml): upload library artifacts alongside object fixtures
• test_module.py: new get_saxpy_library fixture and three tests mirroring from_object coverage (bytes, file path, linker integration)

Checklist

• New or existing tests cover these changes.
• The documentation is up to date with these changes.

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[lijinf2]

/ok to test a0f1507

[github-actions]

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[leofang]

Thanks, Jinfeng! Technically we already tested from_library in the CI!

cuda-python/cuda_core/tests/graph/test_device_launch.py

Line 69 in dad6a42

cudadevrt = ObjectCode.from_library(cudadevrt_path)

But I wouldn't complain for completeness 🙂

Let me get back to review tomorrow...