fix: Add pkg/endpoint back to avoid breaking other projects

[JinnyYi]

ref: #666

[codecov]

Codecov Report

Merging #667 (4f9277c) into master (fbfad9f) will increase coverage by 3.51%.
The diff coverage is 92.10%.

@@            Coverage Diff             @@
##           master     #667      +/-   ##
==========================================
+ Coverage   17.57%   21.09%   +3.51%     
==========================================
  Files          19       21       +2     
  Lines         768      806      +38     
==========================================
+ Hits          135      170      +35     
- Misses        626      629       +3     
  Partials        7        7              

Flag	Coverage Δ
unittests	21.09% <92.10%> (+3.51%)	⬆️

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Impacted Files	Coverage Δ
pkg/endpoint/error.go	25.00% <25.00%> (ø)
pkg/endpoint/endpoint.go	100.00% <100.00%> (ø)

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