[refactor] detection script

[felixdittrich92]

This PR:

• refactored detection script
• add ability to save also as xml
• add minor test

Any feedback is welcome 🤗

[codecov]

Codecov Report

Merging #1060 (0207ac1) into main (a95baaa) will decrease coverage by 0.03%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main    #1060      +/-   ##
==========================================
- Coverage   95.16%   95.12%   -0.04%     
==========================================
  Files         141      141              
  Lines        5827     5827              
==========================================
- Hits         5545     5543       -2     
- Misses        282      284       +2     

Flag	Coverage Δ
unittests	95.12% <ø> (-0.04%)	⬇️

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

Impacted Files	Coverage Δ
doctr/transforms/functional/base.py	94.20% <0.00%> (-2.90%)	⬇️
doctr/transforms/modules/base.py	94.59% <0.00%> (ø)

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