Support Output Files

[jkupferer]

It would be useful if k8s_config supported outputting files recording the configured resources and differences from the desired state.

Output of configured resources could have a number of uses including use as input for a tool such as ArgoCD.

k8s_config_output_file - Output of configured resource states.
k8s_config_output_only - Only generate output files, don't change anything.
k8s_config_status_file - Output for resource status.