Support selectors in prek install/install-hooks/hook-impl

[j178]

Updates #624

You can now use prek install --skip examples/ to set up a hook. Then, every time you run git commit, prek will always skip the examples/ sub-project.

[codecov]

Codecov Report

❌ Patch coverage is 98.52941% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 87.39%. Comparing base (62438bc) to head (8ccadc4).
⚠️ Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
src/cli/install.rs	97.56%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #683      +/-   ##
==========================================
+ Coverage   87.33%   87.39%   +0.06%     
==========================================
  Files          58       58              
  Lines       10265    10322      +57     
==========================================
+ Hits         8965     9021      +56     
- Misses       1300     1301       +1     

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