Support gRPC context propagation in grpcproxy

[ximenzaoshi]

…e problem that watch exits when recvLoop exits but sendLoop still running

Please read https://github.com/etcd-io/etcd/blob/main/CONTRIBUTING.md#contribution-flow.

Trying to fix #18011.

[k8s-ci-robot]

Hi @ximenzaoshi. Thanks for your PR.

I'm waiting for a etcd-io 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.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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[ivanvc]

Hi, @ximenzaoshi, thanks for your PR. It seems like you didn't sign your commit. Could you please amend your commit and push it again? so the developer certificate of origin (DCO) check passes, i.e:

git commit --amend --signoff # Fix the signed off trailer
git push --force

[jmhbnz]

/ok-to-test

[henrybear327]

Hi @ximenzaoshi, it would be nice if the PR title could be updated! :)

[ivanvc]

/retitle Support gRPC context propagation in grpcproxy