Deny clippy::dbg_macro and clippy::todo

[LucaCappelletti94]

Denies clippy::dbg_macro and clippy::todo so debugging output and unfinished stubs cannot land. This removes the one leftover dbg! in a span test, and there is no todo! today.

[github-actions]

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[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 81.24%. Comparing base (7b5821d) to head (fa041dc).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2654      +/-   ##
==========================================
- Coverage   81.24%   81.24%   -0.01%     
==========================================
  Files          42       42              
  Lines       33901    33900       -1     
  Branches    33901    33900       -1     
==========================================
- Hits        27543    27542       -1     
  Misses       2792     2792              
  Partials     3566     3566              

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[alamb]

Nice!