chore: add code spell checker

[Eikykun]

Add crate-ci/typos to find and correct spelling mistakes among source code.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 65.53%. Comparing base (f5921a3) to head (36a432c).

:exclamation: Current head 36a432c differs from pull request most recent head ff3853a. Consider uploading reports for the commit ff3853a to get more accurate results

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #179      +/-   ##
==========================================
+ Coverage   65.45%   65.53%   +0.08%     
==========================================
  Files          74       74              
  Lines        4817     4817              
==========================================
+ Hits         3153     3157       +4     
+ Misses       1377     1374       -3     
+ Partials      287      286       -1     

Flag	Coverage Δ
unittests	65.53% <ø> (+0.08%)	:arrow_up:

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