Standardize newlines at ends of files.

[bdice]

Description

This PR makes all files end with exactly one newline and enforces that rule with a pre-commit hook. The vast majority of files already comply with this rule, which improves consistency in the library's code style.

Checklist

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

[davidwendt]

Did I miss a vote on this somewhere?

[bdice]

Did I miss a vote on this somewhere?

Not yet. I am opening a few standardization PRs like this and am planning to bring them up for discussion.

[codecov]

Codecov Report

Base: 87.40% // Head: 88.12% // Increases project coverage by +0.71% 🎉

Coverage data is based on head (c73c5e1) compared to base (f72c4ce).
Patch has no changes to coverable lines.

Additional details and impacted files

@@               Coverage Diff                @@
##           branch-22.12   #12042      +/-   ##
================================================
+ Coverage         87.40%   88.12%   +0.71%     
================================================
  Files               133      133              
  Lines             21833    22003     +170     
================================================
+ Hits              19084    19390     +306     
+ Misses             2749     2613     -136     

Impacted Files	Coverage Δ
python/strings_udf/strings_udf/__init__.py	86.27% <0.00%> (-10.61%)	⬇️
python/cudf/cudf/io/text.py	91.66% <0.00%> (-8.34%)	⬇️
python/cudf/cudf/core/_base_index.py	81.28% <0.00%> (-4.27%)	⬇️
python/cudf/cudf/io/json.py	92.06% <0.00%> (-2.68%)	⬇️
python/strings_udf/strings_udf/_typing.py	94.73% <0.00%> (-1.06%)	⬇️
python/cudf/cudf/utils/utils.py	89.91% <0.00%> (-0.69%)	⬇️
python/cudf/cudf/testing/dataset_generator.py	72.83% <0.00%> (-0.42%)	⬇️
python/dask_cudf/dask_cudf/core.py	73.72% <0.00%> (-0.41%)	⬇️
python/cudf/cudf/io/parquet.py	90.45% <0.00%> (-0.39%)	⬇️
python/dask_cudf/dask_cudf/backends.py	84.90% <0.00%> (-0.37%)	⬇️
... and 28 more

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[msadang]

LGTM

[bdice]

@gpucibot merge