Add spelling and docstring enforcement

[blink1073]

Based on reading Boring Python: code quality, adding two more checkers: sphinxcontrib-spelling, and interrogate for docstring enforcement, and adding a few more builtin pre-commit checkers.

I'm putting validate-pyproject and check-wheel-contents into the check-python script in jupyter-releaser to centralize those. I tried pyroma but it assumes setuptools is used.

Most of the changes are adding docstrings to modules, classes, and methods.

[codecov]

Codecov Report

Base: 80.07% // Head: 80.01% // Decreases project coverage by -0.06% ⚠️

Coverage data is based on head (0a909a7) compared to base (66dfa0e).
Patch coverage: 100.00% of modified lines in pull request are covered.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1147      +/-   ##
==========================================
- Coverage   80.07%   80.01%   -0.07%     
==========================================
  Files          68       68              
  Lines        8062     8062              
  Branches     1600     1600              
==========================================
- Hits         6456     6451       -5     
- Misses       1183     1186       +3     
- Partials      423      425       +2     

Impacted Files	Coverage Δ
jupyter_server/_tz.py	100.00% <ø> (ø)
jupyter_server/auth/__main__.py	0.00% <ø> (ø)
jupyter_server/auth/identity.py	86.28% <ø> (ø)
jupyter_server/auth/login.py	81.69% <ø> (ø)
jupyter_server/auth/logout.py	77.77% <ø> (ø)
jupyter_server/base/handlers.py	78.82% <ø> (ø)
jupyter_server/base/websocket.py	68.11% <ø> (ø)
jupyter_server/extension/application.py	73.36% <ø> (ø)
jupyter_server/extension/config.py	72.22% <ø> (ø)
jupyter_server/extension/handler.py	67.18% <ø> (ø)
... and 36 more

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