Use gather-based strings factory in cudf::strings::strip

[davidwendt]

Description

Simplifies the cudf::strings::strip function to use the cudf::make_strings_column that accepts an iterator of pairs. This factory has a highly tuned gather implementation for building a strings column from an vector (iterator) of strings in device memory.
This was inspired by the review and work in #11946. This also gives a small improvement in the performance of small columns of large strings and even more improvement in large columns of large-ish strings for strip.
No function has changed just the internal implementation has been simplified.

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: 88.09% // Head: 88.14% // Increases project coverage by +0.04% 🎉

Coverage data is based on head (4e0a5a6) compared to base (6ca2ceb).
Patch coverage: 92.63% of modified lines in pull request are covered.

❗ Current head 4e0a5a6 differs from pull request most recent head e8c2bdc. Consider uploading reports for the commit e8c2bdc to get more accurate results

Additional details and impacted files

@@               Coverage Diff                @@
##           branch-22.12   #11954      +/-   ##
================================================
+ Coverage         88.09%   88.14%   +0.04%     
================================================
  Files               133      133              
  Lines             21905    21982      +77     
================================================
+ Hits              19298    19375      +77     
  Misses             2607     2607              

Impacted Files	Coverage Δ
python/dask_cudf/dask_cudf/backends.py	84.90% <82.92%> (-0.37%)	⬇️
python/cudf/cudf/core/column/column.py	88.46% <100.00%> (+0.04%)	⬆️
python/dask_cudf/dask_cudf/core.py	73.92% <100.00%> (-0.21%)	⬇️
python/dask_cudf/dask_cudf/io/tests/test_csv.py	100.00% <100.00%> (ø)
python/dask_cudf/dask_cudf/io/tests/test_json.py	100.00% <100.00%> (ø)
python/dask_cudf/dask_cudf/io/tests/test_orc.py	100.00% <100.00%> (ø)
...ython/dask_cudf/dask_cudf/io/tests/test_parquet.py	100.00% <100.00%> (ø)
python/dask_cudf/dask_cudf/tests/test_core.py	95.37% <100.00%> (+0.09%)	⬆️
python/cudf/cudf/core/dataframe.py	93.77% <0.00%> (+0.04%)	⬆️
python/cudf/cudf/core/column/string.py	88.65% <0.00%> (+0.12%)	⬆️
... and 3 more

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[upsj]

LGTM, only one question

[davidwendt]

@gpucibot merge