Improve nak pdu api

[robamu]

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[codecov-commenter]

Codecov Report

Attention: 2 lines in your changes are missing coverage. Please review.

Comparison is base (da17922) 96.29% compared to head (0032247) 96.32%.

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Additional details and impacted files

@@            Coverage Diff             @@
##             main      #49      +/-   ##
==========================================
+ Coverage   96.29%   96.32%   +0.03%     
==========================================
  Files          84       84              
  Lines        6365     6451      +86     
==========================================
+ Hits         6129     6214      +85     
- Misses        236      237       +1     

Flag	Coverage Δ
unittests	96.32% <98.43%> (+0.03%)	⬆️

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Files	Coverage Δ
spacepackets/cfdp/conf.py	100.00% <100.00%> (ø)
spacepackets/util.py	91.04% <100.00%> (+0.09%)	⬆️
tests/cfdp/pdus/test_nak_pdu.py	100.00% <100.00%> (ø)
tests/cfdp/test_header.py	100.00% <100.00%> (ø)
tests/test_util.py	97.61% <100.00%> (+0.08%)	⬆️
spacepackets/cfdp/pdu/nak.py	96.69% <89.47%> (-0.37%)	⬇️

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