Implement function to find subgraph and change LayerType assignment

[NeiroYT]

Closes #204 #214

[codecov]

Codecov Report

❌ Patch coverage is 87.38739% with 14 lines in your changes missing coverage. Please review.
✅ Project coverage is 84.90%. Comparing base (13b6788) to head (2d93a81).
⚠️ Report is 5 commits behind head on main.

Files with missing lines	Patch %	Lines
...rc/graph_transformations/graph_transformations.cpp	92.00%	0 Missing and 4 partials ⚠️
include/graph/graph.hpp	89.65%	0 Missing and 3 partials ⚠️
include/layers/InputLayer.hpp	57.14%	0 Missing and 3 partials ⚠️
include/layers/DropOutLayer.hpp	0.00%	0 Missing and 2 partials ⚠️
include/layers/Layer.hpp	0.00%	0 Missing and 1 partial ⚠️
include/layers/OutputLayer.hpp	66.66%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #209      +/-   ##
==========================================
+ Coverage   84.63%   84.90%   +0.26%     
==========================================
  Files          33       34       +1     
  Lines        1829     1914      +85     
  Branches      973     1009      +36     
==========================================
+ Hits         1548     1625      +77     
  Misses        124      124              
- Partials      157      165       +8     

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[aobolensk]

LGTM