Support a pre-configured client-go client

[mengqiy]

Currently, it supports a pre-configured kubectl for a control plane.
We probably should also provide a pre-configured client-go client.

[mengqiy]

cc: @DirectXMan12

[mengqiy]

kubebuilder team can provide a patch if this sounds reasonable.

[DirectXMan12]

probably just a RESTConfig would be nice

[fejta-bot]

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/lifecycle stale

[fejta-bot]

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/lifecycle rotten

[nikhita]

Closing as the repo is going to be archived. Ref: kubernetes/org#1519