runtime-proxy: Add mutex lock to resolve concurrent lru cache access is not safe

[xigang]

Ⅰ. Describe what this PR does

Add mutex lock to resolve concurrent access lru cache is not safe.

Ⅱ. Does this pull request fix one issue?

NONE

Ⅲ. Describe how to verify it

https://github.com/golang/groupcache/blob/master/lru/lru.go#L23

Ⅳ. Special notes for reviews

/cc @eahydra @jasonliu747 @honpey

V. Checklist

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

[xigang]

/assign @honpey

[codecov]

Codecov Report

Patch coverage has no change and project coverage change: +0.04 🎉

Comparison is base (0623ffe) 66.76% compared to head (3d2de20) 66.80%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #1158      +/-   ##
==========================================
+ Coverage   66.76%   66.80%   +0.04%     
==========================================
  Files         273      273              
  Lines       29937    29937              
==========================================
+ Hits        19987    19999      +12     
+ Misses       8526     8515      -11     
+ Partials     1424     1423       -1     

Flag	Coverage Δ
unittests	66.80% <ø> (+0.04%)	⬆️

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see 3 files with indirect coverage changes

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[xigang]

/cc @hormes @FillZpp @eahydra @jasonliu747 Take a look.

[ZYecho]

/LGTM

[hormes]

/approve

[koordinator-bot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: hormes

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• pkg/runtimeproxy/OWNERS [hormes]

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