fix(enum): append index number on duplicate name

[mrlubos]

Fixes #213

[codecov]

Codecov Report

Attention: Patch coverage is 80.88235% with 13 lines in your changes are missing coverage. Please review.

Project coverage is 90.18%. Comparing base (3f195af) to head (6132cf4).

Files	Patch %	Lines
src/utils/enum.ts	20.00%	12 Missing ⚠️
src/utils/handlebars.ts	80.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #217      +/-   ##
==========================================
- Coverage   90.40%   90.18%   -0.22%     
==========================================
  Files          65       65              
  Lines        4003     4026      +23     
  Branches      465      465              
==========================================
+ Hits         3619     3631      +12     
- Misses        383      394      +11     
  Partials        1        1              

Flag	Coverage Δ
unittests	90.18% <80.88%> (-0.22%)	⬇️

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