add run_benchmarks target for running benchmarks with json output

[karthikeyann]

closes #2784
Adds run_benchmarks target for running benchmarks with json output

You can run all benchmarks with make run_benchmarks or ninja run_benchmarks
json will be stored in benchmarks/results/*.json
The benchmark stdout will still print.

[karthikeyann]

rerun tests

[codecov]

Codecov Report

Merging #9879 (1ff7611) into branch-22.02 (967a333) will decrease coverage by 0.06%.
The diff coverage is 5.07%.

@@               Coverage Diff                @@
##           branch-22.02    #9879      +/-   ##
================================================
- Coverage         10.49%   10.42%   -0.07%     
================================================
  Files               119      119              
  Lines             20305    20470     +165     
================================================
+ Hits               2130     2134       +4     
- Misses            18175    18336     +161     

Impacted Files	Coverage Δ
python/cudf/cudf/__init__.py	0.00% <0.00%> (ø)
python/cudf/cudf/core/_base_index.py	0.00% <0.00%> (ø)
python/cudf/cudf/core/column/column.py	0.00% <0.00%> (ø)
python/cudf/cudf/core/column/string.py	0.00% <ø> (ø)
python/cudf/cudf/core/dataframe.py	0.00% <0.00%> (ø)
python/cudf/cudf/core/frame.py	0.00% <0.00%> (ø)
python/cudf/cudf/core/groupby/groupby.py	0.00% <0.00%> (ø)
python/cudf/cudf/core/index.py	0.00% <ø> (ø)
python/cudf/cudf/core/indexed_frame.py	0.00% <0.00%> (ø)
python/cudf/cudf/core/multiindex.py	0.00% <0.00%> (ø)
... and 12 more

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[karthikeyann]

@gpucibot merge