Add GetHealthFeedback RPC

[MyonKeminta]

I wonder if this is an acceptable approach... Ref: https://github.com/tikv/tikv/issues/16297

[ti-chi-bot[bot]]

@crazycs520: adding LGTM is restricted to approvers and reviewers in OWNERS files.

In response to [this](https://github.com/pingcap/kvproto/pull/1239#pullrequestreview-2052159393): > Instructions for interacting with me using PR comments are available [here](https://git.k8s.io/community/contributors/guide/pull-requests.md). If you have questions or suggestions related to my behavior, please file an issue against the [kubernetes/test-infra](https://github.com/kubernetes/test-infra/issues/new?title=Prow%20issue:) repository.

[ti-chi-bot[bot]]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: cfzjywxk, crazycs520

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Needs approval from an approver in each of these files: - ~~[OWNERS](https://github.com/pingcap/kvproto/blob/master/OWNERS)~~ [cfzjywxk] - ~~[proto/OWNERS](https://github.com/pingcap/kvproto/blob/master/proto/OWNERS)~~ [cfzjywxk] Approvers can indicate their approval by writing `/approve` in a comment Approvers can cancel approval by writing `/approve cancel` in a comment

[ti-chi-bot[bot]]

[LGTM Timeline notifier]

Timeline:

• 2024-05-13 09:48:51.029722502 +0000 UTC m=+1473884.786858068: :ballot_box_with_check: agreed by cfzjywxk.

[cfzjywxk]

/merge