Add functions for detection reassembly

[RyanDoesMath]

This pull request introduces three files:

• detection_reassembly.py: This file defines functions for processing detections, specifically:
  • intersection_over_union: Calculates Intersection over Union (IoU) between bounding boxes of detections.
  • non_maximum_suppression: Applies Non-Maximum Suppression (NMS) to remove redundant detections with lower confidence scores.
• detections.py: This file defines the Detection class to represent a single object detection result.
• tests/test_detection_reassembly.py: This file contains unit tests for the functions defined in detection_reassembly.py.

These functions and tests provide a foundation for processing and filtering detections in object detection tasks.

Key improvements:

• Improved accuracy in object detection by removing redundant detections.
• Increased confidence in detections by keeping the most confident ones for each object.
• Enhanced code quality with unit tests ensuring functionality.