Refactor eval_end2end.py to improve modularity

[sweep-nightly[bot]]

Description

This PR refactors the eval_end2end.py file in the tools/end2end directory to improve modularity and code organization. The following changes were made:

• Extracted the code block that calculates the Intersection over Union (IoU) between two polygons into a separate function named calculate_iou.
• Extracted the code block that calculates the edit distance between two strings into a separate function named calculate_edit_distance.
• Extracted the code block that reads ground truth and detection results from files into a separate function named read_files.
• Extracted the code block that matches ground truth and detection results based on IoU into a separate function named match_results.
• Extracted the code block that calculates the precision, recall, and F-measure into a separate function named calculate_metrics.

These changes improve the modularity of the code and make it easier to understand and maintain.

Summary of Changes

• Created a new function calculate_iou to calculate the Intersection over Union (IoU) between two polygons.
• Created a new function calculate_edit_distance to calculate the edit distance between two strings.
• Created a new function read_files to read ground truth and detection results from files.
• Created a new function match_results to match ground truth and detection results based on IoU.
• Created a new function calculate_metrics to calculate precision, recall, and F-measure.

These changes improve the code organization and make it more modular.

Fixes #1.

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