[Feature] Refactor APIServer id and name configuration

[Jeffwan]

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• [X] I had searched in the issues and found no similar feature requirement.

Description

Currently, even we expose id fields for every object in apiserver, we don't use it for resource identification. Instead, we use name

https://github.com/ray-project/kuberay/blob/ee72afc2125bbebd76ee2834c4ef7599d3b53fcd/proto/cluster.proto#L65

https://github.com/ray-project/kuberay/blob/ee72afc2125bbebd76ee2834c4ef7599d3b53fcd/apiserver/pkg/manager/resource_manager.go#L107-L114

There're some historical reasons we left id here. Before the open source version, we internally use UUID as the id. Community forks gave some feedbacks to remove them but we don't have enough time to clean them up prior to open sourcing. Let's make it now.

Use case

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Related issues

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Are you willing to submit a PR?

• [ ] Yes I am willing to submit a PR!