Add statistics for CGLM dataset

[MaxiBoether]

We add some statistic collection for the different CGLM variants and helpful plotting scripts.

PR 1/n of porting SIGMOD changes to main. This one should probably not require an indepth review, mostly stuff I needed. Not the prettiest code, but why bother using defaultdicts :D

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 82.83%. Comparing base (72ffdca) to head (d6d7b72).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #516 +/- ## ======================================= Coverage 82.83% 82.83% ======================================= Files 220 220 Lines 10232 10232 ======================================= Hits 8476 8476 Misses 1756 1756 ```

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[github-actions[bot]]

^{( % to main) ( % to main)}

[XianzheMa]

I'd say let's merge this. It's in the benchmark/ directory; the scripts there are just for quick utility purpose.

It's better to have raw code that helps than not have it.

Let me update the branch, address CI, and merge it when CI passes.