Benchmarking overhaul and pin Flake8 <6

[trexfeathers]

A detailed restructure of the benchmarking architecture in line with what has already been done on SciTools/iris. The original architecture included several experiments which we have since iterated and improved within Iris.

Closes #210.

[codecov[bot]]

Codecov Report

Merging #220 (6957388) into main (10cb843) will not change coverage. The diff coverage is n/a.

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##             main     #220   +/-   ##
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  Coverage   99.36%   99.36%           
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  Files          28       28           
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  Hits         2811     2811           
  Misses         18       18           

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[trexfeathers]

Flake8 failure seems possibly related to pycqa/flake8#1739, but I have not yet worked out what in our config is causing the problem.

[trexfeathers]

See also https://github.com/PyCQA/flake8/pull/1758

[trexfeathers]

Flake8 failure seems possibly related to PyCQA/flake8#1739, but I have not yet worked out what in our config is causing the problem.

Happens even without any config at all in .flake8, so I reckon somethings wrong. I'll pin it

22a6f63fe1ea4990953c0ceb174bca1fcaae96e0

[trexfeathers]

Flake8 failure seems possibly related to pycqa/flake8#1739, but I have not yet worked out what in our config is causing the problem.

Should be fixed once PyCQA/flake8-import-order#190 is in a release.