KEP-5339: add additional cluster-specific auth info field to the cluster profile object

[michaelawyu]

• One-line PR description: this PR updates KEP-5339 to add a field for cluster-specific auth information in the cluster profile API

• Issue link: sig-multicluster's ClusterProfile should have a way to support credentials issuance #5339

• Other comments:

[linux-foundation-easycla]

The committers listed above are authorized under a signed CLA.

• ✅ login: michaelawyu / name: michaelawyu (1cbec78, 792f846, 8d9c0c5, b96d925, bce1a46, c5d0768)

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[k8s-ci-robot]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: michaelawyu
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[k8s-ci-robot]

Hi @michaelawyu. Thanks for your PR.

I'm waiting for a kubernetes member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

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[skitt]

/ok-to-test

[lauralorenz]

Triage notes:

• Needs reviews from the community, please take a look

[skitt]

This looks good to me, thanks; before I approve it, do you have an example handy of a real-world situation showing how these extensions would be used in practice?