feat: using memberlist to discover sandbox-manager and sandbox-gateway

[chengzhycn]

Ⅰ. Describe what this PR does

Ⅱ. Does this pull request fix one issue?

Ⅲ. Describe how to verify it

Ⅳ. Special notes for reviews

[kruise-bot]

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[chengzhycn]

/assign @AiRanthem @furykerry

[codecov]

Codecov Report

❌ Patch coverage is 56.79443% with 124 lines in your changes missing coverage. Please review.
✅ Project coverage is 63.27%. Comparing base (4d5825c) to head (050e6e3).

Files with missing lines	Patch %	Lines
pkg/sandbox-gateway/server/server.go	0.00%	80 Missing ⚠️
pkg/sandbox-manager/core.go	24.32%	28 Missing ⚠️
pkg/utils/utils.go	0.00%	9 Missing ⚠️
pkg/peers/memberlist.go	93.51%	4 Missing and 3 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #220      +/-   ##
==========================================
+ Coverage   61.80%   63.27%   +1.47%     
==========================================
  Files         104      106       +2     
  Lines        6694     6845     +151     
==========================================
+ Hits         4137     4331     +194     
+ Misses       2290     2243      -47     
- Partials      267      271       +4     

Flag	Coverage Δ
unittests	63.27% <56.79%> (+1.47%)	⬆️

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