Refactor windows CNI code to simplify the support of new CNI plugins

[manuelbuil]

Is your feature request related to a problem? Please describe.

Related to #5215, we need to abstract how pebinary talks to the CNI plugin. Right now, as Calico is the only CNI plugin, there is a lot of Calico specific stuff

Describe the solution you'd like

• An interface that each CNI plugin can honor
• A common config struct
  Both objects could be used by pebinary without having to know details on the CNI plugin

Describe alternatives you've considered

Additional context

[rancher-max]

A few issues around this are similar. The code went through a few iterations and required some changes tracked by this, but I'm going to close this one in favor of the Calico and Flannel Windows issues directly.