adds codespell

[jmbhughes]

PR summary

Adds codespell to check spelling in code and documentation

Todos

• test that it works
• fix any existing typos

Test plan

Just inspect

Breaking changes

None

Related Issues

closes #179

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 1 line in your changes missing coverage. Please review.

Project coverage is 93.34%. Comparing base (b6d9b96) to head (4bf43dc).

Files	Patch %	Lines
punchbowl/level2/bright_structure.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #180   +/-   ##
=======================================
  Coverage   93.34%   93.34%           
=======================================
  Files          33       33           
  Lines        2254     2254           
=======================================
  Hits         2104     2104           
  Misses        150      150           

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