feat(tool): restore plugin test server

[ngjaying]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 0.51282% with 194 lines in your changes missing coverage. Please review.

Project coverage is 70.75%. Comparing base (ca32f2c) to head (c3681cd).
Report is 5 commits behind head on master.

Files with missing lines	Patch %	Lines
tools/plugin_server/plugin_test_server.go	0.00%	178 Missing ⚠️
internal/plugin/portable/manager.go	0.00%	15 Missing ⚠️
...rnal/plugin/portable/runtime/plugin_ins_manager.go	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3211      +/-   ##
==========================================
- Coverage   71.05%   70.75%   -0.30%     
==========================================
  Files         392      393       +1     
  Lines       43959    44147     +188     
==========================================
+ Hits        31232    31233       +1     
- Misses      10250    10436     +186     
- Partials     2477     2478       +1     

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