feat(confgen): auto deduce whether the map key is unique

[Kybxd]

• close confgen: auto deduce whether the map key is unique #78

[codecov]

Codecov Report

Attention: Patch coverage is 44.44444% with 80 lines in your changes are missing coverage. Please review.

Project coverage is 65.92%. Comparing base (f3733a9) to head (9099170).

Files	Patch %	Lines
internal/confgen/parser.go	33.33%	72 Missing and 8 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master      #96      +/-   ##
==========================================
+ Coverage   64.77%   65.92%   +1.14%     
==========================================
  Files          39       40       +1     
  Lines        4599     4625      +26     
==========================================
+ Hits         2979     3049      +70     
+ Misses       1241     1194      -47     
- Partials      379      382       +3     

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[wenchy]

LGTM