Refactor image-to-sound script for readability and batch processing

[charann29]

• Improved code readability by adding detailed docstrings and better variable naming.
• Added a function process_images_in_directory to handle batch processing of all image files in a specified directory.
• Enhanced error handling to provide more informative messages during execution.
• Ensured that the script only generates sound files when non-empty text is extracted from images.
• Utilized a context manager (with statement) for opening images to ensure proper resource management.