feat: server start handler

[woorui]

No description provided.

[codecov-commenter]

Codecov Report

Merging #419 (469361f) into master (6b42276) will increase coverage by 0.78%.
The diff coverage is 51.02%.

@@            Coverage Diff             @@
##           master     #419      +/-   ##
==========================================
+ Coverage   59.31%   60.09%   +0.78%     
==========================================
  Files          40       40              
  Lines        2829     2837       +8     
==========================================
+ Hits         1678     1705      +27     
+ Misses       1020     1004      -16     
+ Partials      131      128       -3     

Impacted Files	Coverage Δ
core/yerr/errors.go	100.00% <ø> (ø)
core/server.go	65.61% <40.00%> (+3.14%)	⬆️
core/context.go	93.38% <100.00%> (ø)
core/client.go	63.27% <0.00%> (-0.45%)	⬇️
core/connection.go	89.74% <0.00%> (+23.07%)	⬆️

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