PERF: GH28635 Add ASV benchmark for resample after groupby

[krasch]

• closes Resample on MultiIndex level takes much more time than on normal column #28635 (Replace xxxx with the GitHub issue number)
• Tests added and passed if fixing a bug or adding a new feature
• All code checks passed.
• Added type annotations to new arguments/methods/functions.
• Added an entry in the latest doc/source/whatsnew/vX.X.X.rst file if fixing a bug or adding a new feature.

[phofl]

Thanks for your contribution. Couple of comments.

What is the runtime of the benchmark? We aim for something like 20ms in general.

[krasch]

What is the runtime of the benchmark? We aim for something like 20ms in general

The code as I had first submitted it took 100ms per tested function for one run on my machine, I reduced the size of the dataset so that it is below 20ms now on my machine [1]. Of course my machine is not necessarily representative... If this is not the right aproach, anything I should be doing differently?

asv run -e -E existing -b groupby.Resample --durations

[25.00%] ··· Running (groupby.Resample.time_resample--)..
[75.00%] ··· groupby.Resample.time_resample                                       16.2±0.4ms
[100.00%] ··· groupby.Resample.time_resample_multiindex                           16.9±0.5ms
[100.00%] ·· =========================================== ================
                              benchmark                   total duration 
             ------------------------------------------- ----------------
              groupby.Resample.time_resample_multiindex       508ms      
                    groupby.Resample.time_resample            508ms      
                                total                         1.02s      
             =========================================== ================

[phofl]

Great, thx

[phofl]

thx @krasch