Refactor cmd builder

[dgageot]

No description provided.

[codecov-io]

Codecov Report

Merging #2179 into master will decrease coverage by 0.04%.
The diff coverage is 96.51%.

@@            Coverage Diff            @@
##           master   #2179      +/-   ##
=========================================
- Coverage   58.55%   58.5%   -0.05%     
=========================================
  Files         188     188              
  Lines        7882    7869      -13     
=========================================
- Hits         4615    4604      -11     
+ Misses       2877    2876       -1     
+ Partials      390     389       -1

Impacted Files	Coverage Δ
cmd/skaffold/app/cmd/config/set.go	71.01% <0%> (-3.02%)	⬇️
cmd/skaffold/app/cmd/config/list.go	0% <0%> (-25.81%)	⬇️
cmd/skaffold/app/cmd/config/unset.go	15.38% <0%> (-32.24%)	⬇️
cmd/skaffold/app/cmd/deploy.go	64.28% <100%> (-4.47%)	⬇️
cmd/skaffold/app/cmd/config.go	100% <100%> (ø)	⬆️
cmd/skaffold/app/cmd/dev.go	22.72% <100%> (-1.72%)	⬇️
cmd/skaffold/app/cmd/init.go	55% <100%> (-2.15%)	⬇️
cmd/skaffold/app/cmd/diagnose.go	35% <100%> (-3.1%)	⬇️
cmd/skaffold/app/cmd/debug.go	54.54% <100%> (-7%)	⬇️
cmd/skaffold/app/cmd/fix.go	67.74% <100%> (-1.01%)	⬇️
... and 8 more

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