chore: use errors.Is and errors.Join for customized errors

[panjf2000]

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[codecov]

Codecov Report

Attention: Patch coverage is 80.00000% with 1 line in your changes missing coverage. Please review.

Project coverage is 80.34%. Comparing base (29dca4f) to head (0ad8b95).
Report is 2 commits behind head on dev.

Files with missing lines	Patch %	Lines
engine_unix.go	66.66%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##              dev     #640   +/-   ##
=======================================
  Coverage   80.34%   80.34%           
=======================================
  Files          21       21           
  Lines        2096     2096           
=======================================
  Hits         1684     1684           
  Misses        285      285           
  Partials      127      127           

Flag	Coverage Δ
unittests	80.34% <80.00%> (ø)

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