feat(prek): support prek as hook runner

[noirbizarre]

Hello 👋🏼

This PR completes #67 by supporting prek as a hook runner, aka. the tool used to install pre-commit hooks automatically.

It adds a hook-runner setting supporting the following values:

• pre-commit: the default for backward compatibility
• prek: choose a prek as hook runner
• auto: choose prek if available and fallback on pre-commit (useful for people using tools like mise as they can just install one of the 2 depending on the project and not have to set hook-runner for each project)

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 97.23%. Comparing base (4966c00) to head (434bbad).

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #73      +/-   ##
==========================================
+ Coverage   97.13%   97.23%   +0.10%     
==========================================
  Files          12       12              
  Lines         697      724      +27     
  Branches       62       65       +3     
==========================================
+ Hits          677      704      +27     
  Misses         18       18              
  Partials        2        2              

Flag	Coverage Δ
unittests	97.23% <100.00%> (+0.10%)	⬆️

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