Add Geospatial Masking Functionality

[DGalexander]

Summary

This PR introduces geospatial masking functionality to the MapReader project. The geospatial masking workflow leverages OS Data Hub APIs to extract and mask geospatial data, providing a foundation for enhanced map boundary detection.

Fixes #532

Describe your changes

Key Changes
Added geospatial_masking.py:

• Implements:
• BBOX generation.
• API calls to OS Data Hub.
• Mask creation and export as GeoTIFF and shapefiles.

Modified mapreader->load->images.py:

Integrated geospatial masking functions into the load subpackage.

Testing:

Added unit tests for geospatial masking in tests/test_geospatial_masking.py.

Documentation:

Updated README with usage instructions for geospatial masking.

Checklist before assigning a reviewer (update as needed)

• Self-review code
• Ensure submission passes current tests
• Add tests
• Update relevant docs
• Update changelog

Reviewer checklist

Please add anything you want reviewers to specifically focus/comment on.

• Everything looks ok?

[codecov]

Codecov Report

Attention: Patch coverage is 16.66667% with 20 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
mapreader/load/geo_utils.py	16.66%	20 Missing ⚠️

Flag	Coverage Δ
unittests	77.48% <16.66%> (-0.18%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
mapreader/load/geo_utils.py	61.76% <16.66%> (-24.60%)	⬇️

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