feat: implement some extra utilities

[hyanmandian]

This PR syncs the JavaScript package with utilities already available in the Python library, expanding the public API with a broader set of Brazil-
specific formatters, generators, parsers, validators, and lookup helpers.

What Changed

• Added CNH utilities: formatCnh, isValidCnh, generateCnh, and parseCnh
• Added voter ID utilities: formatVoterId, isValidVoterId, generateVoterId, and parseVoterId
• Added legal nature utilities: formatLegalNature, isValidLegalNature, generateLegalNature, parseLegalNature, and getLegalNatures
• Added license plate utilities: formatLicensePlate, generateLicensePlate, parseLicensePlate, and getFormatLicensePlate
• Added lookup helpers: getCepInfoByAddress, getMunicipality, and isHoliday
• Added generators for additional document/data types: generateCep, generatePhone, generatePis, and generateProcessoJuridico
• Updated public exports in src/index.ts and coverage in src/index.test.ts
• Documented all new utilities in both English and Portuguese docs