fix: Improved Error Handling and Grayscale Support

[skidder]

Improves handling of boundary conditions and grayscale inputs. Key changes include:

1. Function Refactoring:

   • Renamed opencv_copy_with_alpha_blending to opencv_copy_to_region_with_alpha
   • Updated opencv_copy_to_rect to opencv_copy_to_region These changes better reflect the functions' purposes and unify naming conventions.

2. Enhanced Error Handling:

   • Implemented try-catch blocks in C++ functions to catch and log exceptions
   • Added new error codes for more specific error scenarios (e.g., resize failures, conversion issues)
   • Created a centralized error handling function in Go (handleOpenCVError)
   • Improved error reporting with detailed error messages

3. Grayscale Image Support:

   • Added handling for 1-channel (grayscale) images in both main functions
   • Implemented appropriate color space conversions (e.g., GRAY2BGR, GRAY2BGRA)

4. Input Validation and Boundary Checks:

   • Added checks for null and empty matrices
   • Implemented more robust boundary checks for copy operations
   • Added validation for input dimensions

5. Channel Conversion Handling:

   • Added logic to handle mismatched channel counts between source and destination images
   • Implemented appropriate color space conversions (e.g., BGR2BGRA, BGRA2BGR)

6. Performance Considerations:

   • Optimized matrix copying in some scenarios to avoid unnecessary clone() operations

7. Go Wrapper Improvements:

   • Updated function calls to match new C++ function names
   • Enhanced error handling in Go code to utilize new error codes

8. Code Structure and Readability:

   • Improved code organization for better readability and maintainability
   • Added comments to clarify complex operations