Integrate process handling helpers

[cmaglie]

This library was previously inside the Arduino CLI executils package (that is going to be removed).

[codecov-commenter]

Codecov Report

Attention: 29 lines in your changes are missing coverage. Please review.

Comparison is base (7d88805) 71.95% compared to head (f628fa3) 68.56%.
Report is 1 commits behind head on master.

Files	Patch %	Lines
process.go	40.81%	27 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #25      +/-   ##
==========================================
- Coverage   71.95%   68.56%   -3.40%     
==========================================
  Files           6        7       +1     
  Lines         353      404      +51     
==========================================
+ Hits          254      277      +23     
- Misses         67       93      +26     
- Partials       32       34       +2     

Flag	Coverage Δ
unit	68.56% <43.13%> (-3.40%)	⬇️

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