[WIP] Address duplicate import issue found in pypi-installed cuda-core packages

[acosmicflamingo]

Description

Fixes #2023

Right now, importing certain modules also imports a duplicate version where the cuda major version number resides in the name (e.g. importing cuda.core.system will mean both cuda.core.system and cuda.core.cu13.system are now in sys.modules).

It's also difficult to reproduce the problem locally. Running pip install . was not giving me the file path I was expecting to write a failing test, which would allow me to assert that the solution I come up with actually works (assuming that the fix involves recompiling cython modules):

# typing.py location from remote pip install
lib/python3.13/site-packages/cuda/core/cu13/system/typing.py

# typing.py location from remote conda install and local pip install
lib/python3.13/site-packages/cuda/core/system/typing.py

I'm going to make it a draft for now so I can do the following:

• Test that failures does actually occur in CI
• Test that changing relative imports to absolute imports for cuda.core.system does fix it
• Utilize linter functionality to ensure the issue is not reintroduced

If it turns out that the problem goes beyond relative imports in cython, then the fix might have to reside here.

Checklist

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

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[acosmicflamingo]

@mdboom when you have the chance, can you please run /ok to test for me?