[Feat] Add layout detection dataset class

[felixdittrich92]

This PR:

• Add a layout dataset class
• Add tests + docs entry

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 96.55%. Comparing base (db9d92a) to head (2fc0fb3).

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2064      +/-   ##
==========================================
+ Coverage   96.48%   96.55%   +0.07%     
==========================================
  Files         142      143       +1     
  Lines        6111     6153      +42     
==========================================
+ Hits         5896     5941      +45     
+ Misses        215      212       -3     

Flag	Coverage Δ
unittests	96.55% <100.00%> (+0.07%)	⬆️

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