Add gconv custom converter feature.

[joy999]

Please have a check and help improve it.

[codecov-commenter]

Codecov Report

Patch coverage: 74.64% and project coverage change: -0.06% ⚠️

Comparison is base (7961757) 79.16% compared to head (6d249fd) 79.10%.
Report is 3 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2828      +/-   ##
==========================================
- Coverage   79.16%   79.10%   -0.06%     
==========================================
  Files         633      634       +1     
  Lines       52338    52409      +71     
==========================================
+ Hits        41434    41460      +26     
- Misses       8843     8881      +38     
- Partials     2061     2068       +7     

Flag	Coverage Δ
go-1.18-386	79.18% <74.64%> (-0.07%)	⬇️
go-1.18-amd64	79.19% <74.64%> (-0.03%)	⬇️
go-1.19-386	79.08% <74.64%> (-0.03%)	⬇️
go-1.19-amd64	79.04% <74.64%> (-0.08%)	⬇️
go-1.20-386	79.16% <74.64%> (-0.07%)	⬇️
go-1.20-amd64	79.17% <74.64%> (-0.04%)	⬇️

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Files Changed	Coverage Δ
util/gconv/gconv_converter.go	72.30% <72.30%> (ø)
util/gconv/gconv_struct.go	82.62% <100.00%> (+0.22%)	⬆️

... and 2 files with indirect coverage changes

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[gqcn]

@joy999 Awesome! But it needs some time processing code review.