BENCH: programmatically create benchmarks for large ngroups (GH6787) #8410
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closes #6787
Uses ngroups=10000 as suggested in the issue, which takes about 1 hour on my desktop.
For results (vb_suite.log, pkl file) see: https://gist.github.com/dlovell/ea3400273314e7612f6e
Note: gist references a different commit hash. I changed the commit message and added modification to doc/source/v0.15.0.txt, but the actual modifications to vb_suite/groupby.py are principally the same.