Enable debit/credit card transactions and charge validation

• Enable transactions with credit/debit cards
• Handle card transaction authorization processes
• Added charge validation for validating bank account and/or debit/credit card transactions
• Added encryptTransactionData() function to encrypt transaction charge data
• Moved ChrisIdakwo\Support\Entity to a new namespace ChrisIdakwo\Support\Entities\Entity
• Added entity classes to support easy typing of response objects
• Cleaned up codebase