feat: Add options to select numeral forms

[neet]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 38.51852% with 83 lines in your changes missing coverage. Please review.
✅ Project coverage is 78.15%. Comparing base (4526861) to head (d7508a6).

Files with missing lines	Patch %	Lines
ainu-utils/src/numbers/expr.rs	45.83%	39 Missing ⚠️
ainu-utils-python/src/lib.rs	0.00%	24 Missing ⚠️
ainu-utils-js/src/lib.rs	0.00%	20 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #15      +/-   ##
==========================================
- Coverage   85.44%   78.15%   -7.30%     
==========================================
  Files          19       19              
  Lines         639      746     +107     
  Branches      639      746     +107     
==========================================
+ Hits          546      583      +37     
- Misses         54      124      +70     
  Partials       39       39              

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