feat: export COMUNI and PROVINCE data as public constants

[vitomanuguerrasoft]

Exposes the internal municipality (comuni) and province data as public exports to allow external usage for validation, mapping, and UI components.

Changes:

• Add COMUNI_LIST export with user-friendly structure (belfioreCode, province, name, active)
• Export PROVINCE mapping as static property on CodiceFiscale class
• Add TypeScript definitions for IComuneData and IProvinceData interfaces
• Support both CommonJS and ES6 module imports

This allows developers to:

• Import data directly: import { COMUNI, PROVINCE } from 'codice-fiscale-js'
• Access via class: CodiceFiscale.COMUNI and CodiceFiscale.PROVINCE
• Reuse official municipality data without duplication
• Build forms, selectors, and validation services with type safety

Fixes: Resolves feature request for exporting comuni and province data

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