FieldProp(BREAKING!): support unique check of any field in list/map element

[Kybxd]

• close FieldProp(unique): support unique check of any field in list/map element #203
• close confgen(KeyedList): auto deduce whether the list key is unique #188

❗BREAKING CHANGE

If field prop unique is set in map field in a table sheet (Excel/CSV), it will now be generated to scalar field key's field prop of map value, but not the map field itself.

Compatibility resolution

If field prop unique is set in map field in a table sheet (Excel/CSV), please regenerate its proto files for upgrading.
For example:

[codecov]

Codecov Report

Attention: Patch coverage is 79.75460% with 66 lines in your changes missing coverage. Please review.

Project coverage is 69.70%. Comparing base (5f9966c) to head (d9d8d66).
Report is 1 commits behind head on master.

Files with missing lines	Patch %	Lines
internal/confgen/parser.go	75.00%	22 Missing and 8 partials ⚠️
internal/confgen/table_parser.go	86.15%	14 Missing and 4 partials ⚠️
xerrors/ecode.go	0.00%	9 Missing ⚠️
internal/confgen/document_parser.go	90.19%	4 Missing and 1 partial ⚠️
internal/confgen/util.go	66.66%	3 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #205      +/-   ##
==========================================
+ Coverage   69.41%   69.70%   +0.29%     
==========================================
  Files          79       79              
  Lines        9893    10033     +140     
==========================================
+ Hits         6867     6994     +127     
- Misses       2450     2463      +13     
  Partials      576      576              

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