Add gbenchmark for cudf::strings::translate function

[davidwendt]

Reference #5698
This creates a gbenchmark for the cudf::strings::translate() API. The benchmarks measures various sized rows as well as strings lengths and translate table sizes.
This PR also includes changes to translate.cu implementation cleaning up the code and using the more efficient make_strings_children. This change improved performance for all 4 functions on average by 2-3x.
A further improvement was to sort the translation table input to more quickly lookup matches in device code. This added another 2x improvement when using longer translate tables.

[codecov]

Codecov Report

Merging #7617 (40a1c41) into branch-0.19 (7871e7a) will increase coverage by 0.58%.
The diff coverage is 93.16%.

❗ Current head 40a1c41 differs from pull request most recent head 88ae901. Consider uploading reports for the commit 88ae901 to get more accurate results

@@               Coverage Diff               @@
##           branch-0.19    #7617      +/-   ##
===============================================
+ Coverage        81.86%   82.44%   +0.58%     
===============================================
  Files              101      101              
  Lines            16884    17369     +485     
===============================================
+ Hits             13822    14320     +498     
+ Misses            3062     3049      -13     

Impacted Files	Coverage Δ
python/cudf/cudf/core/index.py	93.34% <ø> (+0.48%)	⬆️
python/cudf/cudf/core/series.py	91.65% <ø> (+0.86%)	⬆️
python/cudf/cudf/core/tools/datetimes.py	84.53% <ø> (+0.08%)	⬆️
python/cudf/cudf/utils/cudautils.py	52.94% <ø> (+2.55%)	⬆️
python/cudf/cudf/utils/dtypes.py	89.88% <ø> (+0.37%)	⬆️
python/dask_cudf/dask_cudf/io/orc.py	91.04% <ø> (+0.13%)	⬆️
python/cudf/cudf/core/column/numerical.py	94.83% <87.50%> (-0.20%)	⬇️
python/cudf/cudf/core/frame.py	89.09% <89.47%> (+0.08%)	⬆️
python/cudf/cudf/core/column/column.py	87.86% <90.00%> (+0.10%)	⬆️
python/cudf/cudf/core/column/decimal.py	92.75% <90.32%> (-2.12%)	⬇️
... and 61 more

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[davidwendt]

rerun tests

[harrism]

@gpucibot merge