extract common command config and execution context into a `cmd` package

[codecov-io]

Codecov Report

Merging #212 (1c81646) into master (c921fce) will decrease coverage by 0.33%. The diff coverage is 89.57%.

@@            Coverage Diff             @@
##           master     #212      +/-   ##
==========================================
- Coverage   73.98%   73.64%   -0.34%     
==========================================
  Files          55       59       +4     
  Lines        4402     4444      +42     
==========================================
+ Hits         3257     3273      +16     
- Misses        967      983      +16     
- Partials      178      188      +10     

Impacted Files	Coverage Δ
internal/commands/completion.go	40.00% <0.00%> (ø)
internal/remote/config.go	30.20% <0.00%> (+0.61%)	:arrow_up:
internal/commands/init.go	6.49% <40.00%> (-0.09%)	:arrow_down:
internal/cmd/provider.go	70.00% <70.00%> (ø)
internal/commands/component.go	74.78% <77.77%> (-8.39%)	:arrow_down:
internal/commands/validate.go	91.13% <84.61%> (+0.34%)	:arrow_up:
internal/commands/diff.go	84.57% <90.47%> (-0.73%)	:arrow_down:
internal/cmd/env.go	91.17% <91.17%> (ø)
internal/commands/env.go	95.04% <92.00%> (-1.57%)	:arrow_down:
internal/cmd/base.go	92.13% <92.13%> (ø)
... and 17 more

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