Support bash, fish, zsh, and powershell shell completions as separate sub-commands

docs/cmd/gotk_completion_powershell.md

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+## gotk completion powershell
+
+Generates powershell completion scripts
+
+### Synopsis
+
+Generates powershell completion scripts
+
+```
+gotk completion powershell [flags]
+```
+
+### Examples
+
+```
+To load completion run
+
+. <(gotk completion powershell)
+
+To configure your powershell shell to load completions for each session add to your powershell profile
+
+Windows:
+
+cd "$env:USERPROFILE\Documents\WindowsPowerShell\Modules"
+gotk completion >> gotk-completion.ps1
+
+Linux:
+
+cd "${XDG_CONFIG_HOME:-"$HOME/.config/"}/powershell/modules"
+gotk completion >> gotk-completions.ps1
+
+```
+
+### Options
+
+```
+  -h, --help   help for powershell
+```
+
+### Options inherited from parent commands
+
+```
+      --kubeconfig string   path to the kubeconfig file (default "~/.kube/config")
+      --namespace string    the namespace scope for this operation (default "gitops-system")
+      --timeout duration    timeout for this operation (default 5m0s)
+      --verbose             print generated objects
+```
+
+### SEE ALSO
+
+* [gotk completion](gotk_completion.md)	 - Generates completion scripts for various shells
+