Optimize naive Conv4D with flat contiguous buffers

[aobolensk]

No description provided.

[codecov]

Codecov Report

❌ Patch coverage is 91.04478% with 6 lines in your changes missing coverage. Please review.
✅ Project coverage is 84.69%. Comparing base (ebcf79f) to head (ea25dd9).

Files with missing lines	Patch %	Lines
include/layers/ConvLayer.hpp	91.04%	0 Missing and 6 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #292      +/-   ##
==========================================
+ Coverage   84.58%   84.69%   +0.11%     
==========================================
  Files          61       61              
  Lines        3730     3744      +14     
  Branches     2238     2218      -20     
==========================================
+ Hits         3155     3171      +16     
  Misses        285      285              
+ Partials      290      288       -2     

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