added DDRNet to archive

[kozlov721]

A hotfix to correctly populate the heads field in NN Archive when DDRNet model is used.

[codecov]

Codecov Report

Attention: Patch coverage is 83.33333% with 1 line in your changes missing coverage. Please review.

Project coverage is 95.83%. Comparing base (631b905) to head (2e1c4b5).
Report is 11 commits behind head on main.

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
luxonis_train/core/utils/archive_utils.py	75.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #130      +/-   ##
==========================================
- Coverage   96.31%   95.83%   -0.49%     
==========================================
  Files         147      160      +13     
  Lines        6304     7015     +711     
==========================================
+ Hits         6072     6723     +651     
- Misses        232      292      +60     

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