feat: implement generic pool

[panjf2000]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 94.29825% with 13 lines in your changes missing coverage. Please review.

Project coverage is 93.69%. Comparing base (9a1446b) to head (2c5efe5).
Report is 1 commits behind head on dev.

Files with missing lines	Patch %	Lines
multipool_func_generic.go	88.49%	11 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #351      +/-   ##
==========================================
+ Coverage   89.71%   93.69%   +3.98%     
==========================================
  Files          11       14       +3     
  Lines         797      968     +171     
==========================================
+ Hits          715      907     +192     
+ Misses         62       49      -13     
+ Partials       20       12       -8     

Flag	Coverage Δ
unittests	93.69% <94.29%> (+3.98%)	⬆️

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