Provide report options to separate benchmarks by groups

[sobolevn]

Hi, I am using codspeed in my project: https://github.com/wemake-services/django-modern-rest / https://codspeed.io/wemake-services/django-modern-rest

And I really like the experience. Thanks a lot for building it!

I have several different benchmarks for different parts of the app: https://github.com/wemake-services/django-modern-rest/tree/master/benchmarks/tests

Each benchmark is in its own test module.
Currently the report looks like so:

It is already hard to compare different benchmarks. But, we plan to add even more benches.

My proposal is to add an option to group the final report based on modules.

So it would be like so: --codspeed-group=module --codspeed-sort=slowest:

                                 Benchmark Results                                 
                                 test_router.py                                 
┏━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━┳━━━━━━━━━━━━━┳━━━━━━━━━━┳━━━━━━━━━┓
┃                      Benchmark ┃ Time (best) ┃ Rel. StdDev ┃ Run time ┃   Iters ┃
┡━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━╇━━━━━━━━━━━━━╇━━━━━━━━━━╇━━━━━━━━━┩
│           test_negotiation_raw │        19ns │        2.5% │    2.95s │ 102,737 │
│        test_router_path_native │      13.1ms │        0.6% │    2.98s │     112 │
│           test_router_path_dmr │      10.9ms │        1.9% │    2.97s │     134 │
└────────────────────────────────┴─────────────┴─────────────┴──────────┴─────────┘

                                 test_negotiation.py                                 
┏━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━┳━━━━━━━━━━━━━┳━━━━━━━━━━━━━┳━━━━━━━━━━┳━━━━━━━━━┓
┃                      Benchmark ┃ Time (best) ┃ Rel. StdDev ┃ Run time ┃   Iters ┃
┡━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━╇━━━━━━━━━━━━━╇━━━━━━━━━━━━━╇━━━━━━━━━━╇━━━━━━━━━┩
│ test_negotiation_django_native │       275ns │        2.0% │    2.93s │  27,051 │
│      test_negotiation_compiled │         8ns │        2.6% │    2.87s │ 153,786 │
└────────────────────────────────┴─────────────┴─────────────┴──────────┴─────────┘

Now - everything is clear:

• Everything is groupped by module from --codspeed-group=module
• Everything is sorted by the Time (best) from --codspeed-sort=slowest

What do you think? :)