Provide an example of kube client configuration

[justinas-b]

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Hey! In documentation there is a reference to kube wrapper which could be used with boundary connect (https://github.com/hashicorp/boundary/blob/main/website/content/docs/getting-started/connect-to-target.mdx#built-in-vs-exec), but there are no examples or guides how this could be used and what benefits it would bring.

I am aware of https://github.com/hashicorp/boundary/issues/684, but i am still struggling to understand when this kube wrapper should be used. Maybe if boundary worker is hosted on k8s cluster, it could have kube-api as a target, but then how would one manage authentication part?

Would be really nice to have this covered in more details in documentation