KEP-4933: Support adding label based indexes to apiserver cache

[chenchun]

• One-line PR description: Support adding label based indexes to apiserver cache

• Issue link: Support adding label based indexes to apiserver cache #4933

• Other comments:

[k8s-ci-robot]

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[k8s-ci-robot]

Hi @chenchun. Thanks for your PR.

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[sftim]

Why specifically Spark and Flink?

[chenchun]

You are right. I have add "The same improvements may apply to any other workloads as well if they also list and watch resources by labels." below to clarify this.