Support resource templating via operator plugin

[Danil-Grigorev]

User Story

As a user I would like to template and apply my infrastructure manifests via operator plugin and reuse existing operator state for templating, so I don’t have to duplicate secrets location.

Detailed Description

Currently clusterctl is used to template cluster definitions by using local environment and clusterctl.yaml config. Clusterctl does not rely on cluster-api installation to provide data for templated definitions. Operator, on the other hand, is using secrets to enable a provider and prepare environment for it, therefore removing reliance on the local machine environment.

Operator plugin may leverage this state to template infrastructure definitions on submission.

Anything else you would like to add:

/kind feature

[Fedosin]

/triage accepted