Add spellchecking with crate-ci/typos

[CoolCat467]

In this pull request, we add https://github.com/crate-ci/typos as a pre-commit spellchecker and fix various typos found with this particular spellchecker.

They claim to have more features than codespell, but I don't really see a reason why we couldn't use both as long as they aren't fighting each other.

I learned about crate-ci/typos quite recently when looking through changes made to the mypy daemon as a part of mypy 1.14.0, so I'm not super familiar with how the configuration works, but I think it's at least mostly working as is. What I've tried to add as known "identifiers" with -s in them don't seem to be functioning as I intended however.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00000%. Comparing base (a670d60) to head (db0f0be).

Additional details and impacted files

@@               Coverage Diff               @@
##                 main        #3166   +/-   ##
===============================================
  Coverage   100.00000%   100.00000%           
===============================================
  Files             124          124           
  Lines           18427        18427           
  Branches         1215         1215           
===============================================
  Hits            18427        18427           

Files with missing lines	Coverage Δ
src/trio/_abc.py	100.00000% <ø> (ø)
src/trio/_core/_ki.py	100.00000% <100.00000%> (ø)
src/trio/_core/_parking_lot.py	100.00000% <ø> (ø)
src/trio/_core/_run.py	100.00000% <ø> (ø)
src/trio/_tests/test_threads.py	100.00000% <100.00000%> (ø)
src/trio/_util.py	100.00000% <ø> (ø)

[jakkdl]

this, and the other "miss-nesting"s, are incorrect fixes. https://en.m.wiktionary.org/wiki/misnested (both "misnesting" and "mis-nesting" should be fine, though e.g. my spell-checker in firefox complains about both)