Support branching in NN graphstart

[AndreySorokin7]

Close #182

[codecov]

Codecov Report

❌ Patch coverage is 89.93056% with 29 lines in your changes missing coverage. Please review.
✅ Project coverage is 84.63%. Comparing base (04fdece) to head (58d44e7).
⚠️ Report is 1 commits behind head on main.

Files with missing lines	Patch %	Lines
include/graph/graph.hpp	88.03%	3 Missing and 11 partials ⚠️
src/layers/BinaryOpLayer.cpp	68.42%	4 Missing and 2 partials ⚠️
src/layers/ReduceLayer.cpp	75.00%	1 Missing and 3 partials ⚠️
include/layers/InputLayer.hpp	87.50%	0 Missing and 2 partials ⚠️
src/layers/PoolingLayer.cpp	88.88%	2 Missing ⚠️
src/layers/ConvLayer.cpp	96.66%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #200      +/-   ##
==========================================
+ Coverage   83.62%   84.63%   +1.01%     
==========================================
  Files          33       33              
  Lines        1728     1829     +101     
  Branches      897      973      +76     
==========================================
+ Hits         1445     1548     +103     
+ Misses        130      124       -6     
- Partials      153      157       +4     

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