fix(GenerateDAG): new algorithm and tests

[antoinegelloz]

• much more precise GenerateDAG tests cases
• rewrite of GenerateDAG algorithm

[codecov]

Codecov Report

Attention: Patch coverage is 79.02098% with 30 lines in your changes missing coverage. Please review.

Project coverage is 58.36%. Comparing base (afd0fe7) to head (b36be66).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/dib/generate_dag.go	79.02%	20 Missing and 10 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #614      +/-   ##
==========================================
+ Coverage   57.90%   58.36%   +0.46%     
==========================================
  Files          51       51              
  Lines        2858     2868      +10     
==========================================
+ Hits         1655     1674      +19     
+ Misses       1097     1088       -9     
  Partials      106      106              

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