Refactor and modularize CLI code to improve maintainability

[chilanti]

Items to be considered include:

• Isolating all the Docker interactions to a single module
• Isolating all the Kubernetes interactions to single module
• Revisiting the handling and retrieval of the user "home" directory
• Revisiting the "dry run" logic - evaluate whether it can be isolated rather than being dispersed around the entire code base

[kylegc]

I agree this absolutely needs to be done - soon. Making this an epic.

[EnriqueL8]

@neeraj-laad we could look at tackling this? We can use https://github.com/mibk/dupl to find all the places we have duplications and create issues for this epic.