ci: Set up CodSpeed

[stinodego]

Ref #15531

Changes

• Refactor the H2O AI benchmark script into a pytest setup that works with CodSpeed
• Update R to the latest version - this slightly changes the generated dataset, so some of the test values had to be adjusted

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 81.17%. Comparing base (cb5dd44) to head (8e5b264).
Report is 7 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main   #15537      +/-   ##
==========================================
+ Coverage   81.13%   81.17%   +0.04%     
==========================================
  Files        1363     1367       +4     
  Lines      175161   175307     +146     
  Branches     2527     2527              
==========================================
+ Hits       142112   142313     +201     
+ Misses      32573    32518      -55     
  Partials      476      476              

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[codspeed-hq]

CodSpeed Performance Report

Congrats! CodSpeed is installed 🎉

🆕 22 new benchmarks were detected.

You will start to see performance impacts in the reports once the benchmarks are run from your default branch.

Detected benchmarks

• test_filter1 (1.2 s)
• test_filter2 (2 s)
• test_h2oai_groupby_q1 (6.5 s)
• test_h2oai_groupby_q10 (40.3 s)
• test_h2oai_groupby_q2 (12.8 s)
• test_h2oai_groupby_q3 (8.9 s)
• test_h2oai_groupby_q4 (5.7 s)
• test_h2oai_groupby_q5 (7.2 s)
• test_h2oai_groupby_q6 (14.1 s)
• test_h2oai_groupby_q7 (8.5 s)
• test_h2oai_groupby_q8 (9.3 s)
• test_h2oai_groupby_q9 (13.7 s)
• test_boolean_min_max_agg (15.7 ms)
• test_categorical_vs_str_group_by (14.3 ms)
• test_cross_join (6 ms)
• test_cross_join_slice_pushdown (4.6 ms)
• test_max_statistic_parquet_writer (299.8 ms)
• test_mean_overflow (1.8 s)
• test_min_max_2850 (10.4 ms)
• test_read_scan_large_csv (123.8 s)
• test_sort_nan_1942 (1 ms)
• test_windows_not_cached (3.5 s)