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feat(cnpj): support the alphanumeric CNPJ format (#67)

Adds alphanumeric CNPJ validation (12 alphanumeric + 2 numeric DV) per the
Receita Federal spec, keeping legacy numeric support. Consolidates
#59/#60/#62; base implementation from #62 (@JeanNesi). Full canonical test
set; 115 tests pass.

Co-authored-by: Jean Carlos Nesi <102368879+JeanNesi@users.noreply.github.com>
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>

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