Implement the codespell pre-commit hook

[westford14]

Create the codespell pre-commit hook check. There is more discussion in this, now closed, PR on why we are ignoring the *.ipynb files for the pre-commit hook (and moving those checks to a new CI job).

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📚 Documentation preview 📚: https://causalpy--408.org.readthedocs.build/en/408/

[westford14]

@drbenvincent -- here's the PR for just the pre-commit check

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.35%. Comparing base (66c2623) to head (6aadfe4).
Report is 6 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #408   +/-   ##
=======================================
  Coverage   94.35%   94.35%           
=======================================
  Files          30       30           
  Lines        1967     1967           
=======================================
  Hits         1856     1856           
  Misses        111      111           

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[westford14]

@drbenvincent -- once this gets merged in i'll push up the notebook PR since it's built off of this branch

[drbenvincent]

Looks good to me - thanks for the PR @westford14!