Refactor tools/end2end/eval_end2end.py for modularity

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Description

This PR refactors the tools/end2end/eval_end2end.py file to improve its modularity. The e2e_eval function, which was previously large and complex, has been broken down into smaller, more manageable functions. This makes the code easier to understand and maintain.

Summary of Changes

• Extracted the code block for reading the ground truth and prediction files into a separate function named read_files.
• Extracted the code block for calculating the Intersection over Union (IoU) between two polygons into a separate function named calculate_iou.
• Extracted the code block for calculating the edit distance between two strings into a separate function named calculate_edit_distance.
• Extracted the code block for matching ground truth and prediction data into a separate function named match_gt_and_pred.
• Extracted the code block for calculating the precision, recall, and f-measure into a separate function named calculate_metrics.
• Modified the e2e_eval function to call the newly created functions.

Fixes #1.

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