fix: add Mozambique and Angola validators

[frankdors]

Summary

Adds support for Mozambican and Angolan identification number validators.

Angola (ao)

• BI – Bilhete de Identidade (Angola Identity Card): 14-character number composed of 9 digits, 2 uppercase letters, and 3 digits (e.g. 000204688CA010).
• • NIF – Número de Identificação Fiscal (Angola Tax Identification Number): accepts either a 10-digit company number or a 14-character individual number matching the BI format.

Mozambique (mz)

• BI – Bilhete de Identidade (Mozambican National Identity Document): 13-character number with 12 digits followed by 1 uppercase letter (e.g. 110504162779A).
• • NUIT – Número Único de Identificação Tributária (Mozambican Tax Identification Number): 9-digit number with a check digit validated via a modulo-11 algorithm (e.g. 107705694).

Changes

• Added src/ao/bi.ts and src/ao/nif.ts with full validators, formatters and spec files.
• • Added src/mz/bi.ts and src/mz/nuit.ts with full validators, formatters and spec files.
• • Registered AO and MZ in src/index.ts (stdnum map, personValidators, entityValidators).
• • Updated README.md table with the new country entries.
• • Fixed re-export of Validator to use export type to eliminate TypeScript warnings.

[gemini-code-assist]

Summary of Changes

Hello, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request significantly expands the library's international coverage by adding robust validation and formatting capabilities for key identification numbers from Angola and Mozambique. It ensures that both personal and tax identification documents from these countries can be accurately processed, alongside a minor but important fix for TypeScript type exports.

Highlights

• New Validators for Angola: Added comprehensive validation and formatting logic for Angolan Bilhete de Identidade (BI) and Número de Identificação Fiscal (NIF).
• New Validators for Mozambique: Introduced validation and formatting for Mozambican Bilhete de Identidade (BI) and Número Único de Identificação Tributária (NUIT).
• Library Integration: Integrated the new Angolan and Mozambican validators into the main library index, making them accessible via stdnum, personValidators, and entityValidators.
• Documentation Update: Updated the README.md file to include the newly supported Angolan and Mozambican identification types.
• TypeScript Type Export Fix: Corrected the re-export of the Validator type in src/index.ts to use export type to resolve TypeScript warnings.

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[gemini-code-assist]

Code Review

This pull request introduces new validators for Angola (BI and NIF) and Mozambique (BI and NUIT), along with their corresponding tests and registration in the library. Feedback identifies a critical need for case normalization in the cleaning phase to prevent validation failures on lowercase inputs. Additionally, improvements were suggested for the accuracy of documentation comments regarding identifier formats and the alphabetical ordering of entries in the README.