[FEATURE] - Implement withdrawal functionality

[Gustavonobregab]

Descrição da proposta

Adds complete withdrawal functionality to the AbacatePay SDK, including:

• Support for creating PIX withdrawals with various key types (CPF, CNPJ, EMAIL, PHONE, RANDOM)
• Ability to list all withdrawals
• Proper TypeScript types and interfaces following the existing codebase patterns
• Comprehensive test coverage for all withdrawal methods
• Integration with the existing SDK structure

The implementation follows the official AbacatePay API schema for withdrawal endpoints:

• POST /withdraw/create - Create new withdrawal
• GET /withdraw/list - List all withdrawals

Contexto adicional

No response

Impacto esperado

• Melhora significativa na usabilidade
• Facilita manutenção ou refatoração
• Reduz custo de desenvolvimento no longo prazo
• Outro (descrever acima)

[almeidazs]

Opa mano, o SDK foi movido completamente para github.com/AbacatePay/ecosystem/tree/main/packages/sdk e agora tem suporte para withdraw/payouts.

Com suporte completo para a v1 e v2.