🔧 MAINTAIN: Add a profiler tox env

[hukkin]

Now that mistletoe beat us (congrats to them!) I was curious to see if there's any easy ways to improve our performance and regain the number one spot 😄 I came up with a profiler tox env and thought you may want to merge it to the repository?

[codecov]

Codecov Report

Merging #197 (2001ad3) into master (d6adf66) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #197   +/-   ##
=======================================
  Coverage   96.17%   96.17%           
=======================================
  Files          61       61           
  Lines        3267     3267           
=======================================
  Hits         3142     3142           
  Misses        125      125           

Flag	Coverage Δ
pytests	96.17% <ø> (ø)

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