Add pytest opts and use isort

[blink1073]

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[codecov-commenter]

Codecov Report

Merging #762 (6d96c89) into main (4087b98) will decrease coverage by 0.63%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main     #762      +/-   ##
==========================================
- Coverage   70.80%   70.17%   -0.64%     
==========================================
  Files          62       62              
  Lines        7629     7486     -143     
  Branches     1221     1221              
==========================================
- Hits         5402     5253     -149     
- Misses       1850     1858       +8     
+ Partials      377      375       -2     

Impacted Files	Coverage Δ
jupyter_server/extension/config.py	72.22% <ø> (ø)
jupyter_server/pytest_plugin.py	84.16% <ø> (ø)
jupyter_server/terminal/__init__.py	79.16% <ø> (ø)
jupyter_server/__init__.py	64.28% <100.00%> (ø)
jupyter_server/_tz.py	94.44% <100.00%> (-0.56%)	⬇️
jupyter_server/auth/decorator.py	81.25% <100.00%> (-1.61%)	⬇️
jupyter_server/auth/login.py	68.70% <100.00%> (-0.24%)	⬇️
jupyter_server/auth/security.py	75.67% <100.00%> (-0.65%)	⬇️
jupyter_server/base/handlers.py	65.23% <100.00%> (-0.50%)	⬇️
jupyter_server/base/zmqhandlers.py	52.65% <100.00%> (-0.26%)	⬇️
... and 35 more

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