Remove cudf_io namespace alias

[vuule]

Description

Some cuIO tests and benchmarks declare cudf_io alias for cudf::io. This saves a single letter so it's considered to be of very low utility.

Removing all occurrences of this alias.
Also removed a couple of builder calls where the option was being set to default value.

Checklist

• I am familiar with the Contributing Guidelines.
• New or existing tests cover these changes.
• The documentation is up to date with these changes.

[codecov]

Codecov Report

Base: 87.40% // Head: 87.52% // Increases project coverage by +0.11% 🎉

Coverage data is based on head (a594c67) compared to base (f72c4ce).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@               Coverage Diff                @@
##           branch-22.12   #11827      +/-   ##
================================================
+ Coverage         87.40%   87.52%   +0.11%     
================================================
  Files               133      133              
  Lines             21833    21825       -8     
================================================
+ Hits              19084    19103      +19     
+ Misses             2749     2722      -27     

Impacted Files	Coverage Δ
python/cudf/cudf/utils/ioutils.py	79.47% <ø> (ø)
...thon/dask_cudf/dask_cudf/tests/test_distributed.py	18.86% <ø> (+4.94%)	⬆️
python/cudf/cudf/core/scalar.py	90.52% <100.00%> (+1.25%)	⬆️
python/dask_cudf/dask_cudf/sorting.py	93.29% <100.00%> (+2.11%)	⬆️
python/strings_udf/strings_udf/_typing.py	94.73% <0.00%> (-1.06%)	⬇️
python/cudf/cudf/testing/dataset_generator.py	72.83% <0.00%> (-0.42%)	⬇️
python/cudf/cudf/__init__.py	90.69% <0.00%> (ø)
python/strings_udf/strings_udf/__init__.py	97.50% <0.00%> (+0.62%)	⬆️
... and 1 more

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[vuule]

rerun tests

[vuule]

@gpucibot merge