Fuse Convolution + Activation node as a part of graph transformations pipeline

[NeiroYT]

Closes #272

[codecov]

Codecov Report

❌ Patch coverage is 87.50000% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 85.15%. Comparing base (156dacc) to head (e305545).
⚠️ Report is 3 commits behind head on main.

Files with missing lines	Patch %	Lines
src/layers_fused/ConvRelu.cpp	81.81%	2 Missing ⚠️
include/layers_fused/ConvRelu.hpp	91.66%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #276      +/-   ##
==========================================
+ Coverage   83.95%   85.15%   +1.20%     
==========================================
  Files          56       59       +3     
  Lines        3097     3442     +345     
  Branches     1855     2121     +266     
==========================================
+ Hits         2600     2931     +331     
- Misses        245      248       +3     
- Partials      252      263      +11     

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