Refactor CLI code

# What
Add structure to the plugin package.

# Why
Over time with the adding of more command to the CLI the plugin package will get messy. We want to add structure to the package before this mess becomes a problem.

# How
Move required dns operator internal packages out of internal

Move the DNS CLI commands to the kuadrant-cli.

# Done
Code for the plugin is moved to kuadrant-ctl.

Start by mapping the plugin package, the required DNS operator internal packages, and the DNS CLI commands. Trace how those commands are assembled and identify the move to kuadrant-cli or kuadrant-ctl; the work is done when the plugin code is moved to kuadrant-ctl and the package has the requested structure.

Written by the indexing model from the issue text.