fix(generic): support conversion from string to int and float for json generic to be consistent with the original json generic

[Marina-Sakai]

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fix

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[codecov]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.01% 🎉

Comparison is base (f548715) 68.96% compared to head (8cf99a0) 68.97%.

❗ Current head 8cf99a0 differs from pull request most recent head f774b44. Consider uploading reports for the commit f774b44 to get more accurate results

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1090      +/-   ##
===========================================
+ Coverage    68.96%   68.97%   +0.01%     
===========================================
  Files          252      252              
  Lines        18831    18831              
===========================================
+ Hits         12987    12989       +2     
+ Misses        4669     4668       -1     
+ Partials      1175     1174       -1     

Files Changed	Coverage Δ
pkg/generic/option.go	100.00% <ø> (ø)
pkg/generic/json_test/generic_init.go	57.37% <100.00%> (ø)

... and 1 file with indirect coverage changes

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