Enhance memory management and validation in runtime

- Added null checks for Region and memory data to prevent runtime errors.
- Improved validation logic in Region.Validate to include checks for zero capacity and alignment.
- Updated readMemory and writeMemory functions to ensure proper alignment and bounds checking.
- Refactored input data handling in WazeroRuntime to validate and write environment, info, and message data with proper alignment.
- Enhanced error reporting for memory operations and JSON validation to improve debugging capabilities.