[Infrastructure] User Infrastructure as a Code approach

[alefesta]

The current implementation of the Infrastructure through k3ai init is to use a single config yaml file. We aim to transform the config file into a plugin type to make it more flexible.
The idea is to have a structure similar to:

apiVersion: k3ai.in/v1alpha1
kind: Infra
metadata:
    name: "mycluster"
    type: k3s
    baseUrl: "https://k3s.io...."
resources:
    - linux:
        installCmd: "...."
        args: "..." 
    - windows:
    - mac:
    - wsl: