pytests suite for algorithm evaluation

[urabrobot]

Sub tasks:

• load existing gt labels for gate
• write label comparer
• streamline to make runnable via one-line command
• expanding IOU to work with all polygons instead of just rectangles
• figure out whether it's worth it to include single points as an edge case

[ayushhariharan]

loaded existing gt labels for gate (different purest suite for each algorithm). Pytest already runnable via one-line command. Expanded IOU to work with all polygons instead of just rectangles.