Add strings tests to transpose_test.cpp

[davidwendt]

This is a follow on to PR #9937.

Adds to the gtests in transpose_test.cpp to include strings as supported by cudf::transpose. No function has changed -- only additional tests have been added.

The utility functions in transpose_test.cpp were enhanced to include string types by accepting a column-wrapper type template parameter as required.

[codecov]

Codecov Report

Merging #9985 (9c6f60e) into branch-22.02 (967a333) will decrease coverage by 0.03%.
The diff coverage is n/a.

@@               Coverage Diff                @@
##           branch-22.02    #9985      +/-   ##
================================================
- Coverage         10.49%   10.45%   -0.04%     
================================================
  Files               119      119              
  Lines             20305    20417     +112     
================================================
+ Hits               2130     2134       +4     
- Misses            18175    18283     +108     

Impacted Files	Coverage Δ
python/custreamz/custreamz/kafka.py	29.16% <0.00%> (-0.63%)	⬇️
python/dask_cudf/dask_cudf/sorting.py	92.30% <0.00%> (-0.61%)	⬇️
python/cudf/cudf/__init__.py	0.00% <0.00%> (ø)
python/cudf/cudf/core/frame.py	0.00% <0.00%> (ø)
python/cudf/cudf/core/index.py	0.00% <0.00%> (ø)
python/cudf/cudf/io/parquet.py	0.00% <0.00%> (ø)
python/cudf/cudf/core/series.py	0.00% <0.00%> (ø)
python/cudf/cudf/utils/utils.py	0.00% <0.00%> (ø)
python/cudf/cudf/utils/dtypes.py	0.00% <0.00%> (ø)
python/cudf/cudf/utils/ioutils.py	0.00% <0.00%> (ø)
... and 17 more

---

Continue to review full report at Codecov.

Legend - Click here to learn more
Δ = absolute <relative> (impact), ø = not affected, ? = missing data
Powered by Codecov. Last update eba4f03...9c6f60e. Read the comment docs.

[davidwendt]

@gpucibot merge