[builder] Add objectness scores

[felixdittrich92]

This PR:

• sync with [builder] Add objectness scores mindee/doctr#1625

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.07%. Comparing base (50e124e) to head (04381e8).

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Additional details and impacted files

@@            Coverage Diff             @@
##             main      #14      +/-   ##
==========================================
+ Coverage   98.00%   98.07%   +0.06%     
==========================================
  Files          63       63              
  Lines        1855     1870      +15     
==========================================
+ Hits         1818     1834      +16     
+ Misses         37       36       -1     

Flag	Coverage Δ
unittests	98.07% <100.00%> (+0.06%)	⬆️

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