feat: use execa for cross platform search path support

[pi0]

Try using execa for better cross platform support (search path for corepack). Later might remove again to reduce footprint

[codecov]

Codecov Report

Merging #54 (f55616a) into main (cabbe7b) will increase coverage by 0.11%.
The diff coverage is 89.47%.

❗ Current head f55616a differs from pull request most recent head ecd0561. Consider uploading reports for the commit ecd0561 to get more accurate results

@@            Coverage Diff             @@
##             main      #54      +/-   ##
==========================================
+ Coverage   96.89%   97.00%   +0.11%     
==========================================
  Files           5        5              
  Lines         161      167       +6     
  Branches       29       27       -2     
==========================================
+ Hits          156      162       +6     
  Misses          5        5              

Impacted Files	Coverage Δ
src/spawn.ts	93.75% <89.47%> (+1.44%)	⬆️

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