Enhance Prompt Processing: Added 2 Functions in src/sample.py and 1 Function in lib/utils.py for Improved Console Input Handling

[Vishwa2684]

This pull request introduces a modularized code structure to streamline the usage and demonstration of the DF-GAN pre-trained model. It prepares the foundation for creating a notebook demonstrating the model's capabilities. The code has been refactored for better usability, flexibility, and maintainability.

PS I'm new to open source contributions and I appreciate any guidance or feedback on my contributions. Thank you!