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)
• 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.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.

[codecov]

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

@@            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	Coverage Δ
unittests	52.56% <30.00%> (-0.07%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files	Coverage Δ
scheduler/service/service_v2.go	82.49% <75.00%> (ø)
scheduler/rpcserver/scheduler_server_v2.go	2.94% <0.00%> (-0.64%)	⬇️

... and 5 files with indirect coverage changes