Move application logic to an internal package

[corneliusweig]

No description provided.

[codecov-io]

Codecov Report

Merging #43 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master      #43   +/-   ##
=======================================
  Coverage   41.88%   41.88%           
=======================================
  Files           9        9           
  Lines         382      382           
=======================================
  Hits          160      160           
  Misses        200      200           
  Partials       22       22

Impacted Files	Coverage Δ
internal/ketall/options/options.go	19.04% <ø> (ø)
cmd/root.go	68.18% <ø> (ø)	⬆️
internal/ketall/filter/filter.go	74.64% <ø> (ø)
internal/ketall/version/version.go	27.27% <ø> (ø)
internal/ketall/printer/table_printer.go	0% <ø> (ø)
internal/ketall/printer/adapter.go	80% <ø> (ø)
internal/ketall/client/client.go	23.13% <ø> (ø)
cmd/version.go	66.66% <ø> (ø)	⬆️

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