Enhance xml import utility

[chandrikarj]

Enhancements to XML import: Color parsing, polyline handling, independent annotations, and bounding boxes

Summary

-Color Representation Fix:
The line color in the XML annotation is now correctly parsed from a decimal representation to a hexadecimal format.

-Handling Polyline vs. Polygon:
The XML import utility now differentiates between Polyline and polygons.
Now, if the region type is Polyline, it is correctly mapped to a LineString, while Polygon regions remain unchanged.

-Independent Annotation Groups:
Each XML annotation group is now processed as a separate annotation object.

-Bounding Box Implementation:
The bounding box is calculated as the smallest enclosing rectangle around the annotation, using the min/max X and Y coordinates.

The videos demonstrating the changes are below :

Before:

Screen.Recording.2025-02-12.at.11.46.13.PM.mov

After:

Screen.Recording.2025-02-12.at.11.46.57.PM.mov

Motivation

This PR improves the XML import utility by addressing multiple issues outlined in Issue #1081.

[chandrikarj]

Hey @birm,
Please take a look.

Also I feel like the GitHub Actions axe tests in are failing due to a ChromeDriver version mismatch. axe-cli is using Chrome 133 because GitHub Actions is installing the latest Chrome by default, but the workflow in .github/workflows/axe-a11y-check.yml is manually installing ChromeDriver 125, causing the failure. Just thought should let you know this is happening.

Thanks.

[birm]

Hi @chandrikarj -- don't worry about the axe check at this point.
I'll review this in earnest soon! Thanks for the contribution!

[chandrikarj]

Thanks, @birm