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 (9b68283, 9b663b4, 133f634)

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