Use zod for input validation 🦹

[jamacku]

replaces: #223

[codecov]

Codecov Report

Attention: 21 lines in your changes are missing coverage. Please review.

Comparison is base (1aa0b37) 83.88% compared to head (c05c76b) 66.38%.
Report is 3 commits behind head on main.

❗ Current head c05c76b differs from pull request most recent head 8f60651. Consider uploading reports for the commit 8f60651 to get more accurate results

Files	Patch %	Lines
src/config.ts	55.17%	13 Missing ⚠️
src/labeler.ts	77.77%	8 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##             main     #275       +/-   ##
===========================================
- Coverage   83.88%   66.38%   -17.50%     
===========================================
  Files           5        4        -1     
  Lines         515      238      -277     
  Branches       90       27       -63     
===========================================
- Hits          432      158      -274     
+ Misses         83       80        -3     

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