feat(sdk): Surface kubernetes configuration in container builder

[casassg]

Description of your changes:

Python Kubernetes SDK doesn't handle well tokens that expire. GCP default authentication has set its own custom refresh token, but for other kubernetes API authentication mechanisms it's not trivial to implement.

In order to customize authentication, users of the python sdk can customize the client configuration object to set a custom refresh_api_key_hook and provide it to load_kube_config.

With this change, in ContainerBuilder, we can inject a custom client configuration that will be used by the client to check the kaniko execution.

I avoided setting it for load_incluster_config as usually that uses the internal token provider in the cluster and therefore has less need to be customized. To avoid confusion, I can name it kubernetes_outcluster_configuration?

Related issues: kubernetes-client/python#741

[google-oss-robot]

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[casassg]

/assign @ji-yaqi

Assigning as PR is pretty small (lmk whats the acceptable process for this in the future pls)

[casassg]

rebumping this up!

[casassg]

@chensun any chance to check this one? Im happy to close if deemed not appropriate

[chensun]

/ok-to-test

[chensun]

/lgtm
/approve

[google-oss-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: chensun

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