Add `poi protect/unprotect` commands

[seachicken]

Resolves #92

Support for local branch protection.

gh poi protect <branch>...
gh poi unprotect <branch>...

[codecov[bot]]

Codecov Report

Merging #93 (6f154ab) into main (7bf5b1c) will decrease coverage by 8.38%. The diff coverage is 24.48%.

:exclamation: Current head 6f154ab differs from pull request most recent head e5376a0. Consider uploading reports for the commit e5376a0 to get more accurate results

@@            Coverage Diff             @@
##             main      #93      +/-   ##
==========================================
- Coverage   87.95%   79.57%   -8.38%     
==========================================
  Files           3        4       +1     
  Lines         664      759      +95     
==========================================
+ Hits          584      604      +20     
- Misses         60      132      +72     
- Partials       20       23       +3     

Impacted Files	Coverage Δ
protect.go	0.00% <0.00%> (ø)
main.go	58.69% <13.72%> (-18.52%)	:arrow_down:
poi.go	89.74% <85.00%> (-0.20%)	:arrow_down:

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