Add run cmd

[fpliger]

Close #9

I'm intentionally using run instead of serve as cmd name because I think it's more user friendly. Happy to be convinced otherwise :)

[mattkram]

I agree it's more intuitive 😁. Serve is technically correct, but that's an implementation detail.

[codecov-commenter]

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Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (9ad6714) to head (16c9e76).
Report is 48 commits behind head on main.

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Additional details and impacted files

@@            Coverage Diff            @@
##              main       #84   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            3         5    +2     
  Lines          240       287   +47     
=========================================
+ Hits           240       287   +47     

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