Refactor payment handling to use unified hook-based approach

- Updated README.md to reflect new `usePayment` hook and improved payment processing examples.
- Modified Android native module to support new payment parameter types.
- Refactored App component to utilize the new `usePayment` hook for payment operations.
- Simplified payment request structure and updated related utility functions.
- Enhanced payment presets for better usability and consistency.
- Removed deprecated payment functions and streamlined the payment process.

Author: mCodex