move generating commands under 'ksctl generate' sub-command

[MatousJobanek]

• create ksctl generate sub-command
• move & rename ksctl adm generate-cli-configs into ksctl generate cli-configs
• move & rename ksctl adm setup into ksctl generate admin-manifests
• move other related adm/setup_*.go files to the folder generate/ and drop the setup_ prefix

KUBESAW-54

[xcoulon]

Looks good. Just a simple suggestion for the Generate cmd short/long explanations.

[codecov]

Codecov Report

Merging #29 (9c4c924) into master (f971092) will decrease coverage by 0.24%.
The diff coverage is 5.88%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #29      +/-   ##
==========================================
- Coverage   65.27%   65.04%   -0.24%     
==========================================
  Files          40       41       +1     
  Lines        2042     2051       +9     
==========================================
+ Hits         1333     1334       +1     
- Misses        551      559       +8     
  Partials      158      158              

Files	Coverage Δ
pkg/cmd/adm/adm.go	0.00% <ø> (ø)
pkg/cmd/generate/cluster.go	82.60% <ø> (ø)
pkg/cmd/generate/permissions.go	79.84% <ø> (ø)
pkg/cmd/generate/roles_manager.go	76.92% <ø> (ø)
pkg/cmd/generate/util.go	75.83% <ø> (ø)
pkg/cmd/root.go	88.23% <100.00%> (+0.35%)	⬆️
pkg/cmd/generate/cli_configs.go	73.61% <0.00%> (ø)
pkg/cmd/generate/admin-manifests.go	37.73% <0.00%> (ø)
pkg/cmd/generate/generate.go	0.00% <0.00%> (ø)