feat: 'String incrementer'

[marcobiedermann]

Add 'String incrementer' kata

[codecov]

Codecov Report

❌ Patch coverage is 87.50000% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 99.95%. Comparing base (f2f5123) to head (0d2843c).
⚠️ Report is 309 commits behind head on main.

Files with missing lines	Patch %	Lines
kata/5 kyu/string-incrementer/index.ts	87.50%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##              main     #177      +/-   ##
===========================================
- Coverage   100.00%   99.95%   -0.05%     
===========================================
  Files          490      491       +1     
  Lines         2480     2488       +8     
  Branches       383      386       +3     
===========================================
+ Hits          2480     2487       +7     
- Misses           0        1       +1     

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