utils: add metric server client

[zwzhang0107]

Ⅰ. Describe what this PR does

add metric server client util

Ⅱ. Does this pull request fix one issue?

Ⅲ. Describe how to verify it

Ⅳ. Special notes for reviews

V. Checklist

• I have written necessary docs and comments
• I have added necessary unit tests and integration tests
• All checks passed in make test

[codecov]

Codecov Report

Attention: Patch coverage is 95.00000% with 6 lines in your changes are missing coverage. Please review.

Project coverage is 67.34%. Comparing base (b547abb) to head (b9a1bc7).
Report is 22 commits behind head on main.

Files	Patch %	Lines
pkg/util/metricserver/metrics_client.go	86.04%	4 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1881      +/-   ##
==========================================
+ Coverage   67.25%   67.34%   +0.08%     
==========================================
  Files         411      413       +2     
  Lines       45875    45995     +120     
==========================================
+ Hits        30853    30975     +122     
+ Misses      12785    12776       -9     
- Partials     2237     2244       +7     

Flag	Coverage Δ
unittests	67.34% <95.00%> (+0.08%)	⬆️

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[hormes]

/lgtm
/approve

[koordinator-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: hormes

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