Use stream in groupby calls

[karthikeyann]

sort_groupby_helper::

• sorted_values()
• grouped_values()
• unique_keys()
• sorted_keys()
• num_groups()
• num_keys()
• key_sort_order()
• group_offsets()
• group_labels()
• unsorted_keys_labels()
• keys_bitmask_column()

groupby::

• - dispatch_aggregation()

[codecov]

Codecov Report

Merging #7705 (b817be4) into branch-0.19 (7871e7a) will increase coverage by 0.64%.
The diff coverage is n/a.

❗ Current head b817be4 differs from pull request most recent head 87989c6. Consider uploading reports for the commit 87989c6 to get more accurate results

@@               Coverage Diff               @@
##           branch-0.19    #7705      +/-   ##
===============================================
+ Coverage        81.86%   82.50%   +0.64%     
===============================================
  Files              101      101              
  Lines            16884    17442     +558     
===============================================
+ Hits             13822    14391     +569     
+ Misses            3062     3051      -11     

Impacted Files	Coverage Δ
python/cudf/cudf/core/buffer.py	84.21% <ø> (+4.96%)	⬆️
python/cudf/cudf/core/column/categorical.py	91.97% <ø> (+0.58%)	⬆️
python/cudf/cudf/core/column/column.py	87.61% <ø> (-0.15%)	⬇️
python/cudf/cudf/core/column/datetime.py	89.63% <ø> (+0.54%)	⬆️
python/cudf/cudf/core/column/decimal.py	92.75% <ø> (-2.12%)	⬇️
python/cudf/cudf/core/column/lists.py	90.00% <ø> (-1.40%)	⬇️
python/cudf/cudf/core/column/numerical.py	94.83% <ø> (-0.20%)	⬇️
python/cudf/cudf/core/column/string.py	86.79% <ø> (+0.30%)	⬆️
python/cudf/cudf/core/column/timedelta.py	88.57% <ø> (+0.33%)	⬆️
python/cudf/cudf/core/column_accessor.py	96.13% <ø> (+0.82%)	⬆️
... and 56 more

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[karthikeyann]

@gpucibot merge