Convert cudf::rank to use device_uvector

[harrism]

Converts cudf::rank to use device_uvector instead of device_vector.
Also adds a benchmark for cudf::rank.

Contributes to #7287

Performance is at most 1.7% slower and up to 12% faster.

Comparing /home/mharris/rapids/cudf/cpp/build/rank_before.json to /home/mharris/rapids/cudf/cpp/build/rank_after.json
Benchmark                                            Time             CPU      Time Old      Time New       CPU Old       CPU New
---------------------------------------------------------------------------------------------------------------------------------
Rank/no_nulls/1024/manual_time                    +0.0170         +0.0140             0             0             0             0
Rank/no_nulls/4096/manual_time                    +0.0092         +0.0076             0             0             0             0
Rank/no_nulls/32768/manual_time                   +0.0034         +0.0042             0             0             0             0
Rank/no_nulls/262144/manual_time                  -0.0542         -0.0574             0             0             0             0
Rank/no_nulls/2097152/manual_time                 -0.0493         -0.0509             1             1             1             1
Rank/no_nulls/16777216/manual_time                -0.1217         -0.1289             7             6             7             6
Rank/no_nulls/67108864/manual_time                +0.0007         +0.0005            24            24            24            24
Rank/nulls/1024/manual_time                       -0.0392         -0.0370             0             0             0             0
Rank/nulls/4096/manual_time                       -0.0173         -0.0160             0             0             0             0
Rank/nulls/32768/manual_time                      +0.0021         +0.0027             0             0             0             0
Rank/nulls/262144/manual_time                     -0.0027         -0.0025             0             0             0             0
Rank/nulls/2097152/manual_time                    +0.0002         -0.0003             7             7             7             7
Rank/nulls/16777216/manual_time                   -0.0409         -0.0334            59            56            58            56
Rank/nulls/67108864/manual_time                   -0.0003         -0.0004           232           232           232           232

[codecov]

Codecov Report

Merging #8029 (4892858) into branch-0.20 (51336df) will decrease coverage by 0.05%.
The diff coverage is 89.88%.

@@               Coverage Diff               @@
##           branch-0.20    #8029      +/-   ##
===============================================
- Coverage        82.88%   82.83%   -0.06%     
===============================================
  Files              103      103              
  Lines            17668    17796     +128     
===============================================
+ Hits             14645    14742      +97     
- Misses            3023     3054      +31     

Impacted Files	Coverage Δ
python/cudf/cudf/core/column/__init__.py	100.00% <ø> (ø)
python/cudf/cudf/io/orc.py	86.89% <ø> (ø)
python/cudf/cudf/utils/dtypes.py	81.87% <ø> (-1.57%)	⬇️
python/cudf/cudf/utils/cudautils.py	57.75% <25.00%> (ø)
python/cudf/cudf/core/column/numerical.py	94.43% <72.72%> (ø)
python/cudf/cudf/core/column/column.py	88.64% <75.00%> (ø)
python/cudf/cudf/core/column/decimal.py	90.08% <78.26%> (-2.85%)	⬇️
python/dask_cudf/dask_cudf/backends.py	89.51% <80.00%> (-0.08%)	⬇️
python/cudf/cudf/core/dataframe.py	90.87% <83.33%> (+0.01%)	⬆️
python/cudf/cudf/utils/utils.py	90.00% <95.00%> (+0.49%)	⬆️
... and 25 more

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[harrism]

@gpucibot merge