Add missing cuda-python dependency to cudf

[bdice]

This PR:

• adds a missing cuda-python dependency to cudf's setup.py. The package is used here (it is currently being supplied as a transitive dependency of RMM, but we should list all dependencies explicitly):

  cudf/python/cudf/cudf/utils/gpu_utils.py

  Line 18 in 0cc29a0

  from cuda.cudart import cudaDeviceAttr, cudaError_t

• standardizes declarations of Cython dependencies (it is only a build system dependency in pyproject.toml, and never needed at runtime via install_requires in setup.py)
• standardizes definition of extras_require across all included Python packages

[bdice]

This list was getting unwieldy so I sorted it. The only changes are removing Cython and adding cuda-python.

[bdice]

Standardized this file to match cudf's pyproject.toml.

[codecov]

Codecov Report

Merging #10833 (2a82878) into branch-22.06 (8d861ce) will decrease coverage by 0.08%.
The diff coverage is 94.84%.

❗ Current head 2a82878 differs from pull request most recent head 6112af7. Consider uploading reports for the commit 6112af7 to get more accurate results

@@               Coverage Diff                @@
##           branch-22.06   #10833      +/-   ##
================================================
- Coverage         86.40%   86.31%   -0.09%     
================================================
  Files               143      144       +1     
  Lines             22448    22648     +200     
================================================
+ Hits              19396    19549     +153     
- Misses             3052     3099      +47     

Impacted Files	Coverage Δ
python/cudf/cudf/core/column/string.py	88.78% <ø> (-0.31%)	⬇️
python/cudf/cudf/core/frame.py	93.41% <ø> (ø)
python/cudf/cudf/core/indexed_frame.py	91.70% <ø> (ø)
python/cudf/cudf/io/__init__.py	100.00% <ø> (ø)
python/cudf/cudf/testing/testing.py	81.81% <50.00%> (+0.12%)	⬆️
python/cudf/cudf/io/parquet.py	90.83% <86.60%> (-1.87%)	⬇️
python/cudf/cudf/core/index.py	92.06% <88.88%> (-0.25%)	⬇️
python/cudf/cudf/core/scalar.py	89.01% <90.90%> (-0.31%)	⬇️
python/cudf/cudf/core/dataframe.py	93.78% <96.36%> (+0.08%)	⬆️
python/cudf/cudf/__init__.py	90.69% <100.00%> (+0.22%)	⬆️
... and 30 more

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[bdice]

@gpucibot merge