[py]: new tox recipe for isort

[symonk]

I hope to break these kind of changes down into single changes; for now a lot of proof of concept ideas. Here is a new tox recipe used via tox -e isort that keeps our imports PEP compliant and consistent. This buys us:

• Consistent code base
• Organised imports for free
• Less merge conflicts

This uses isort a very popular import linter and for now is entirely opt in via tox -e isort which at present only covers the test/ directory; I'd like to expand it across selenium/ also once we are happy with it as a POC. I want to bolt on some other stuff as well which will be somewhat similar.

If you like it i will follow up PRs with additional tooling to help us improve our contributing UX and general code consistency. Eventually we will look at enforcing the new recipes (including the existing flake8 stuff) through a tox -e linting 'parent', but for now let's be opt in to avoid any teething issues.

Thanks

This is a sub part of #10761

edit: This was open for a while, I went ahead and applied it over selenium/ & tests/

[codecov-commenter]

Codecov Report

Base: 52.63% // Head: 53.28% // Increases project coverage by +0.65% 🎉

Coverage data is based on head (b063faf) compared to base (316f973).
Patch coverage: 95.88% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##            trunk   #11005      +/-   ##
==========================================
+ Coverage   52.63%   53.28%   +0.65%     
==========================================
  Files          81       81              
  Lines        5388     5472      +84     
  Branches      270      270              
==========================================
+ Hits         2836     2916      +80     
- Misses       2282     2286       +4     
  Partials      270      270              

Impacted Files	Coverage Δ
py/selenium/common/__init__.py	100.00% <ø> (ø)
py/selenium/types.py	100.00% <ø> (ø)
py/selenium/webdriver/chromium/service.py	76.92% <ø> (ø)
...lenium/webdriver/common/actions/pointer_actions.py	20.48% <ø> (ø)
py/selenium/webdriver/common/log.py	26.47% <ø> (ø)
py/selenium/webdriver/common/timeouts.py	91.11% <ø> (ø)
py/selenium/webdriver/firefox/firefox_profile.py	32.70% <ø> (ø)
...lenium/webdriver/support/event_firing_webdriver.py	33.60% <ø> (ø)
py/selenium/webdriver/webkitgtk/service.py	36.36% <ø> (ø)
py/selenium/webdriver/wpewebkit/service.py	36.36% <ø> (ø)
... and 46 more

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