BUG: disable import cuda error when cpu only in a shared python env

[ChengjieLi28]

Shared python environments that contain cuda-related environments but do not actually have GPU environments on the machine only show warnings.

Fixes https://github.com/xorbitsai/xorbits/issues/595

Check code requirements

• [ ] tests added / passed (if needed)
• [ ] Ensure all linting tests pass

[codecov[bot]]

Codecov Report

Merging #47 (7a7335a) into main (7db36a2) will decrease coverage by 3.61%. The diff coverage is n/a.

@@            Coverage Diff             @@
##             main      #47      +/-   ##
==========================================
- Coverage   93.84%   90.23%   -3.61%     
==========================================
  Files          42       42              
  Lines        3361     3358       -3     
  Branches      672      349     -323     
==========================================
- Hits         3154     3030     -124     
- Misses        136      244     +108     
- Partials       71       84      +13     

Flag	Coverage Δ
unittests	90.23% <ø> (-3.47%)	:arrow_down:

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see 14 files with indirect coverage changes