feat: run cluster templating non interactive

[leonsteinhaeuser]

Description

This PR adds a non-interactive functionality to render the cluster configuration to disk. The interactive menu has not been touched and is not expected to break. To use the non-interactive functionality, add the 'run' subcommand to the CLI run command. The CLI also supports rendering an helper menu. To open the menu, define the “-h” or “--help” flag as part of the command. This will display the context menu with all available subcommands and flags available at this level.

Example:

helper menu:

go run cmd/main.go --help                                     
Usage:
  root [flags]
  root [command]

Available Commands:
  completion  Generate the autocompletion script for the specified shell
  help        Help about any command
  run         Render the cluster configuration

Flags:
  -h, --help   help for root

Use "root [command] --help" for more information about a command.

render cluster:

go run cmd/main.go run -e dev -s dev -c hugi