OS-level file mapping for JSON reads

[Semyon1104]

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[Semyon1104]

a detailed summary of the total statistics for each layer has also been added

[codecov]

Codecov Report

❌ Patch coverage is 70.00000% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 83.93%. Comparing base (156dacc) to head (64560ec).

Files with missing lines	Patch %	Lines
src/Weights_Reader/reader_weights.cpp	77.77%	1 Missing and 1 partial ⚠️
include/graph/graph.hpp	0.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #275      +/-   ##
==========================================
- Coverage   83.95%   83.93%   -0.02%     
==========================================
  Files          56       56              
  Lines        3097     3100       +3     
  Branches     1855     1855              
==========================================
+ Hits         2600     2602       +2     
  Misses        245      245              
- Partials      252      253       +1     

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