Dev text spotting

[rwood-97]

Summary

This PR adds new developments to the text spotting code:

• Adds deduplicate methods for removing overlapping polygons within a patch and also between patches
• Add overlap option when creating patches
• Adds Runner base class to remove repeated code in the two different runners.

Fixes #404
Fixes #405

Describe your changes

Describe changes/updates you have made to the code.

Checklist before assigning a reviewer (update as needed)

• Self-review code
• Ensure submission passes current tests
• Update relevant docs
• Add tests where possible
  Note: I haven't added tests for the deepsolo/dptext part because of installing detectron2, will make an issue about this

Reviewer checklist

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

• Everything looks ok?

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 10.00000% with 189 lines in your changes missing coverage. Please review.

Project coverage is 62.69%. Comparing base (6f19e41) to head (1d76188).
Report is 12 commits behind head on main.

Files	Patch %	Lines
mapreader/spot_text/runner_base.py	0.00%	169 Missing ⚠️
mapreader/spot_text/deepsolo_runner.py	0.00%	10 Missing ⚠️
mapreader/spot_text/dptext_detr_runner.py	0.00%	10 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #435      +/-   ##
==========================================
+ Coverage   62.43%   62.69%   +0.25%     
==========================================
  Files          40       41       +1     
  Lines        6780     6757      -23     
==========================================
+ Hits         4233     4236       +3     
+ Misses       2547     2521      -26     

Flag	Coverage Δ
unittests	62.69% <10.00%> (+0.25%)	⬆️

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