Add DataFrame.pivot_table.

[bdice]

Description

This PR adds the method DataFrame.pivot_table to enhance pandas API compatibility. It uses the exact same arguments as cudf.pivot_table but automatically supplies the first argument (a DataFrame).

Related: #11314

Checklist

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

[mroeschke]

Should all the arguments that aren't supported and raise NotImplementedError be tested as well? https://github.com/rapidsai/cudf/pull/11314/files#diff-a3d6b9fab46a4b2a1de7c903eab52bda471251b40452b1ac172d9d02a35a8f2bR1341

[bdice]

Should all the arguments that aren't supported and raise NotImplementedError be tested as well? https://github.com/rapidsai/cudf/pull/11314/files#diff-a3d6b9fab46a4b2a1de7c903eab52bda471251b40452b1ac172d9d02a35a8f2bR1341

Since this code is a pure wrapper around the module-level function, I didn’t add any tests beyond some API parametrizations. We could do that for completeness but code coverage won’t change.

[mroeschke]

Since this code is a pure wrapper around the module-level function, I didn’t add any tests beyond some API parametrizations. We could do that for completeness but code coverage won’t change.

SGTM

[codecov]

Codecov Report

Base: 87.40% // Head: 88.15% // Increases project coverage by +0.74% 🎉

Coverage data is based on head (d0d4733) compared to base (f72c4ce).
Patch has no changes to coverable lines.

❗ Current head d0d4733 differs from pull request most recent head fc2f3e7. Consider uploading reports for the commit fc2f3e7 to get more accurate results

Additional details and impacted files

@@               Coverage Diff                @@
##           branch-22.12   #12015      +/-   ##
================================================
+ Coverage         87.40%   88.15%   +0.74%     
================================================
  Files               133      133              
  Lines             21833    21981     +148     
================================================
+ Hits              19084    19378     +294     
+ Misses             2749     2603     -146     

Impacted Files	Coverage Δ
python/strings_udf/strings_udf/__init__.py	84.31% <0.00%> (-12.57%)	⬇️
python/cudf/cudf/io/text.py	91.66% <0.00%> (-8.34%)	⬇️
python/cudf/cudf/core/_base_index.py	82.20% <0.00%> (-3.35%)	⬇️
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/dask_cudf/dask_cudf/core.py	73.72% <0.00%> (-0.41%)	⬇️
python/dask_cudf/dask_cudf/backends.py	84.90% <0.00%> (-0.37%)	⬇️
python/cudf/cudf/io/orc.py	92.94% <0.00%> (-0.09%)	⬇️
python/cudf/cudf/__init__.py	90.69% <0.00%> (ø)
python/cudf/cudf/core/udf/_ops.py	100.00% <0.00%> (ø)
... and 23 more

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[shwina]

@gpucibot merge