feat: add cache peer to grpc api

[gaius-qi]

Description

Related Issue

Motivation and Context

Screenshots (if appropriate)

Types of changes

• [ ] Bug fix (non-breaking change which fixes an issue)
• [x] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to change)
• [ ] Documentation Update (if none of the other choices apply)

Checklist

• [ ] My change requires a change to the documentation.
• [ ] I have updated the documentation accordingly.
• [x] I have read the CONTRIBUTING document.
• [ ] I have added tests to cover my changes.

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 30.00000% with 14 lines in your changes missing coverage. Please review.

Project coverage is 52.56%. Comparing base (dc0a171) to head (c130474).

Additional details and impacted files

[](https://app.codecov.io/gh/dragonflyoss/Dragonfly2/pull/3334?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=dragonflyoss) ```diff @@ Coverage Diff @@ ## main #3334 +/- ## ========================================== - Coverage 52.63% 52.56% -0.07% ========================================== Files 192 192 Lines 20456 20468 +12 ========================================== - Hits 10766 10759 -7 - Misses 8886 8905 +19 Partials 804 804 ``` | [Flag](https://app.codecov.io/gh/dragonflyoss/Dragonfly2/pull/3334/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=dragonflyoss) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/dragonflyoss/Dragonfly2/pull/3334/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=dragonflyoss) | `52.56% <30.00%> (-0.07%)` | :arrow_down: | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=dragonflyoss#carryforward-flags-in-the-pull-request-comment) to find out more. | [Files](https://app.codecov.io/gh/dragonflyoss/Dragonfly2/pull/3334?dropdown=coverage&src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=dragonflyoss) | Coverage Δ | | |---|---|---| | [scheduler/service/service\_v2.go](https://app.codecov.io/gh/dragonflyoss/Dragonfly2/pull/3334?src=pr&el=tree&filepath=scheduler%2Fservice%2Fservice_v2.go&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=dragonflyoss#diff-c2NoZWR1bGVyL3NlcnZpY2Uvc2VydmljZV92Mi5nbw==) | `82.49% <75.00%> (ø)` | | | [scheduler/rpcserver/scheduler\_server\_v2.go](https://app.codecov.io/gh/dragonflyoss/Dragonfly2/pull/3334?src=pr&el=tree&filepath=scheduler%2Frpcserver%2Fscheduler_server_v2.go&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=dragonflyoss#diff-c2NoZWR1bGVyL3JwY3NlcnZlci9zY2hlZHVsZXJfc2VydmVyX3YyLmdv) | `2.94% <0.00%> (-0.64%)` | :arrow_down: | ... and [5 files with indirect coverage changes](https://app.codecov.io/gh/dragonflyoss/Dragonfly2/pull/3334/indirect-changes?src=pr&el=tree-more&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=dragonflyoss)