Merge batch-prediction-feature into main

[ByteBard58]

• Add preprocess helper and file-based prediction endpoint
• Add python-multipart to requirements.txt
• Add batch file prediction endpoint in app.py
• Add sample_generator.py for basic testing
• Add docstring documentation for sample_generator.py
• Add new front end modification for the new batch prediction feature
• Modify CI script
• Fix input handling bug in app.py
• Modify sample_generator.py to return valid sample files
• Add dataset format guidelines to UI and fix blank output bar bug
• Fix "always 1% confidence" bug in app.py by modifying the round function
• Modify app.py to prevent saving the buffer on disk and processing the entire cycle in memory
• Add httpx in requirements.txt